State legislative incumbents in contested primaries, 2018

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Last updated on November 18, 2024

There were 6,065 state legislative seats up for election on November 6, 2018, in 46 states. Overall, 4,874 incumbents filed for re-election and were running at the time of their respective primaries. Of that total, 1,082 incumbents faced contested primaries, representing 22% of all incumbents who filed for re-election. This was the second-largest number and percentage of incumbents in contested primaries since Ballotpedia began gathering data in 2010.

A primary is contested when there are more candidates running than nominations available. When this occurs, and an incumbent is present, it means the incumbent could possibly lose the primary. Learn more about the terms and methodologies used in this analysis.

Ballotpedia uses the number and percentage of incumbents in contested primaries to help determine the overall competitiveness of an election cycle. A larger number of contested primaries indicates more opportunities for voters to elect a non-incumbent to office. A smaller number indicates fewer of those opportunities.

In 2018:

There were 491 Democratic incumbents in contested primaries, representing 23% of all Democratic incumbents who filed for re-election, a 22% increase from 2016.

There were 590 Republican incumbents in contested primaries, representing 22% of all Republican incumbents who filed for re-election, a 1% increase from 2016.

There was one minor party or independent incumbent in contested primaries, representing 3% of all minor party or independent incumbents who filed for re-election.

The total number of incumbents in contested primaries—1,082—was up from 2016 (985), representing a 10% increase.

State legislative incumbents in contested primaries, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	4,956	1,797	394	21.9%	2,190	482	22.0%	4,013	876	21.8%
Senate	1,109	377	97	25.7%	481	108	22.5%	861	206	23.9%
Total	6,065	2,174	491	22.6%	2,671	590	22.1%	4,874	1,082	22.2%

Click [show] on the table below to view incumbents in contested primaries statistics by state in 2018. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries, 2018
State	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
Nationwide	6,065	2,174	491	22.6%	2,671	590	22.1%	4,874	1,082	22.2%
Alabama	140	32	17	53.1%	70	19	27.1%	102	36	35.3%
Alaska	50	14	0	0.0%	21	11	52.4%	37	11	29.7%
Arizona	90	24	8	33.3%	33	19	57.6%	57	27	47.4%
Arkansas	118	21	4	19.0%	73	11	15.1%	95	15	15.8%
California	100	59	25	42.4%	27	12	44.4%	86	37	43.0%
Colorado	82	27	0	0.0%	30	5	16.7%	57	5	8.8%
Connecticut	187	84	5	6.0%	79	0	0.0%	163	5	3.1%
Delaware	51	21	3	14.3%	16	0	0.0%	37	3	8.1%
Florida	140	39	11	28.2%	63	8	12.7%	102	19	18.6%
Georgia	236	82	27	32.9%	134	26	19.4%	216	53	24.5%
Hawaii	63	50	23	46.0%	4	0	0.0%	54	23	42.6%
Idaho	105	14	1	7.1%	75	30	40.0%	89	31	34.8%
Illinois	157	77	10	13.0%	52	7	13.5%	129	17	13.2%
Indiana	125	28	7	25.0%	83	16	19.3%	111	23	20.7%
Iowa	125	48	1	2.1%	55	4	7.3%	103	5	4.9%
Kansas	125	40	7	17.5%	72	19	26.4%	112	26	23.2%
Kentucky	119	29	4	13.8%	69	15	21.7%	98	19	19.4%
Maine	186	74	2	2.7%	53	0	0.0%	130	2	1.5%
Maryland	188	95	81	85.3%	54	26	48.1%	149	107	71.8%
Massachusetts	200	137	19	13.9%	37	1	2.7%	176	20	11.4%
Michigan	148	32	14	43.8%	46	9	19.6%	78	23	29.5%
Minnesota	134	41	5	12.2%	70	2	2.9%	111	7	6.3%
Missouri	180	34	7	20.6%	83	12	14.5%	117	19	16.2%
Montana	125	34	1	2.9%	55	9	16.4%	89	10	11.2%
Nebraska	24	3	0	0.0%	12	4	33.3%	16	5	31.3%
Nevada	53	24	3	12.5%	14	5	35.7%	38	8	21.1%
New Hampshire	424	147	30	20.4%	170	57	33.5%	320	87	27.2%
New Mexico	70	35	5	14.3%	26	1	3.8%	61	6	9.8%
New York	213	131	27	20.6%	64	4	6.3%	195	31	15.9%
North Carolina	170	57	11	19.3%	96	28	29.2%	153	39	25.5%
North Dakota	72	11	0	0.0%	49	6	12.2%	60	6	10.0%
Ohio	116	25	6	24.0%	49	14	28.6%	74	20	27.0%
Oklahoma	125	22	2	9.1%	60	35	58.3%	82	37	45.1%
Oregon	73	42	4	9.5%	23	5	21.7%	65	9	13.8%
Pennsylvania	228	82	14	17.1%	114	8	7.0%	196	22	11.2%
Rhode Island	113	86	20	23.3%	12	0	0.0%	98	20	20.4%
South Carolina	124	42	11	26.2%	74	25	33.8%	116	36	31.0%
South Dakota	105	9	3	33.3%	70	17	24.3%	79	20	25.3%
Tennessee	116	20	7	35.0%	69	17	24.6%	89	24	27.0%
Texas	165	57	17	29.8%	94	33	35.1%	151	50	33.1%
Utah	89	14	0	0.0%	51	3	5.9%	65	3	4.6%
Vermont	180	88	15	17.0%	44	4	9.1%	148	19	12.8%
Washington	123	59	16	27.1%	47	18	38.3%	106	34	32.1%
West Virginia	117	38	15	39.5%	60	25	41.7%	99	40	40.4%
Wisconsin	116	37	3	8.1%	63	1	1.6%	100	4	4.0%
Wyoming	75	9	0	0.0%	56	19	33.9%	65	19	29.2%

Historical comparison

The chart below shows a breakdown of incumbents in contested primaries from 2010 to 2018.

Click [show] on the table below to view overall incumbents in contested primaries statistics by state from 2010 to 2018. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries, 2010-2018
State
	2010		2012		2014		2016		2018
	Cont.	%	Cont.	%	Cont.	%	Cont.	%	Cont.	%
Nationwide	995	20.0%	1,117	23.3%	983	19.5%	985	20.2%	1,082	22.2%
Alabama	34	28.1%	-	-	40	33.6%	-	-	36	35.3%
Alaska	6	13.3%	16	29.6%	4	8.5%	12	29.3%	11	29.7%
Arizona	26	51.0%	24	40.0%	28	42.4%	19	29.7%	27	47.4%
Arkansas	4	6.3%	12	13.6%	8	9.2%	10	9.8%	15	15.8%
California	6	9.7%	22	39.3%	23	34.3%	25	33.8%	37	43.0%
Colorado	1	1.6%	4	7.5%	2	3.4%	5	8.5%	5	8.8%
Connecticut	10	6.0%	7	4.3%	9	5.5%	10	6.1%	5	3.1%
Delaware	7	14.6%	11	20.8%	9	18.4%	6	12.0%	3	8.1%
Florida	18	18.6%	31	28.2%	21	17.2%	14	14.3%	19	18.6%
Georgia	41	20.7%	48	22.9%	47	21.5%	49	22.9%	53	24.5%
Hawaii	24	41.4%	26	36.6%	20	34.5%	24	39.3%	23	42.6%
Idaho	26	27.1%	34	48.6%	30	31.9%	31	32.3%	31	34.8%
Illinois	21	16.5%	33	22.8%	14	11.2%	17	11.8%	17	13.2%
Indiana	21	18.6%	17	16.5%	11	9.4%	17	15.7%	23	20.7%
Iowa	8	7.4%	16	16.0%	8	7.3%	9	8.0%	5	4.9%
Kansas	23	20.0%	54	42.5%	21	18.8%	39	29.5%	26	23.2%
Kentucky	21	18.8%	22	20.8%	15	13.9%	16	14.7%	19	19.4%
Maine	4	2.8%	5	4.1%	3	2.2%	4	2.7%	2	1.5%
Maryland	105	64.8%	-	-	94	68.1%	-	-	107	71.8%
Massachusetts	14	8.4%	19	10.0%	17	9.6%	20	10.7%	20	11.4%
Michigan	17	25.0%	37	40.2%	28	28.9%	23	33.8%	23	29.5%
Minnesota	8	4.5%	11	7.1%	5	4.2%	11	6.4%	7	6.3%
Missouri	15	14.3%	35	27.8%	22	15.0%	21	14.8%	19	16.2%
Montana	11	14.7%	17	20.7%	18	22.5%	14	17.5%	10	11.2%
Nebraska	6	28.6%	4	25.0%	1	14.3%	4	28.6%	5	31.3%
Nevada	5	19.2%	12	33.3%	13	30.2%	17	41.5%	8	21.1%
New Hampshire	124	38.5%	145	46.0%	104	33.2%	125	40.7%	87	27.2%
New Mexico	14	20.9%	24	26.4%	7	11.9%	9	8.8%	6	9.8%
New York	37	19.8%	33	17.5%	27	14.1%	33	17.0%	31	15.9%
North Carolina	39	25.7%	37	29.1%	29	18.6%	31	20.7%	39	25.5%
North Dakota	2	3.5%	10	16.4%	4	6.8%	7	13.0%	6	10.0%
Ohio	14	16.1%	14	14.3%	23	25.6%	14	16.3%	20	27.0%
Oklahoma	12	11.7%	19	18.6%	13	13.7%	28	33.3%	37	45.1%
Oregon	9	13.0%	4	6.1%	6	10.0%	4	6.9%	9	13.8%
Pennsylvania	29	14.0%	32	15.8%	42	20.7%	28	13.4%	22	11.2%
Rhode Island	34	34.7%	26	26.0%	18	17.1%	18	17.1%	20	20.4%
South Carolina	26	23.2%	23	15.5%	20	17.4%	42	27.5%	36	31.0%
South Dakota	7	9.9%	25	33.8%	17	23.0%	18	28.6%	20	25.3%
Tennessee	12	11.3%	35	35.7%	25	24.0%	34	31.2%	24	27.0%
Texas	28	17.8%	51	34.7%	39	26.0%	46	30.7%	50	33.1%
Utah	9	11.1%	14	17.9%	4	5.2%	6	7.9%	3	4.6%
Vermont	13	8.2%	12	7.7%	8	5.2%	27	17.8%	19	12.8%
Washington	24	23.3%	15	15.3%	23	20.7%	32	31.1%	34	32.1%
West Virginia	52	50.5%	45	45.9%	34	32.1%	38	40.9%	40	40.4%
Wisconsin	13	14.0%	15	16.0%	3	3.4%	8	7.8%	4	4.0%
Wyoming	15	25.0%	21	35.0%	26	40.6%	20	36.4%	19	29.2%

Alabama

There were 140 seats up for election in Alabama. A total of 102 incumbents filed for re-election: 32 Democrats and 70 Republicans. Of that total, 36 incumbents—17 Democrats and 19 Republicans—faced contested primaries, representing 35.3% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Alabama, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	105	25	15	60.0%	53	14	26.4%	78	29	37.2%
Senate	35	7	2	28.6%	17	5	29.4%	24	7	29.2%
Total	140	32	17	53.1%	70	19	27.1%	102	36	35.3%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Alabama, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	140	69	21	30.4%	51	13	25.5%	121	34	28.1%
2012	Did not hold elections.
2014	140	42	13	31.0%	76	27	35.5%	119	40	33.6%
2016	Did not hold elections.
2018	140	32	17	53.1%	70	19	27.1%	102	36	35.3%

See also:

• Alabama House of Representatives elections, 2018
• Alabama State Senate elections, 2018

Alaska

There were 50 seats up for election in Alaska. A total of 37 incumbents filed for re-election: 14 Democrats, 21 Republicans, and two minor party or independent incumbents. Of that total, 11 incumbents—zero Democrats and 11 Republicans—faced contested primaries, representing 29.7% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Alaska, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	40	13	0	0.0%	16	9	56.3%	31	9	29.0%
Senate	10	1	0	0.0%	5	2	40.0%	6	2	33.3%
Total	50	14	0	0.0%	21	11	52.4%	37	11	29.7%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Alaska, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	50	22	1	4.5%	23	5	21.7%	45	6	13.3%
2012	59	21	3	14.3%	32	13	40.6%	54	16	29.6%
2014	54	18	1	5.6%	29	3	10.3%	47	4	8.5%
2016	50	18	2	11.1%	22	10	45.5%	41	12	29.3%
2018	50	14	0	0.0%	21	11	52.4%	37	11	29.7%

See also:

• Alaska House of Representatives elections, 2018
• Alaska State Senate elections, 2018

Arizona

There were 90 seats up for election in Arizona. A total of 57 incumbents filed for re-election: 24 Democrats and 33 Republicans. Of that total, 27 incumbents—eight Democrats and 19 Republicans—faced contested primaries, representing 47.4% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Arizona, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	60	16	7	43.8%	25	15	60.0%	41	22	53.7%
Senate	30	8	1	12.5%	8	4	50.0%	16	5	31.3%
Total	90	24	8	33.3%	33	19	57.6%	57	27	47.4%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Arizona, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	90	20	7	35.0%	31	19	61.3%	51	26	51.0%
2012	90	17	11	64.7%	43	13	30.2%	60	24	40.0%
2014	90	27	6	22.2%	39	22	56.4%	66	28	42.4%
2016	90	26	11	42.3%	38	8	21.1%	64	19	29.7%
2018	90	24	8	33.3%	33	19	57.6%	57	27	47.4%

See also:

• Arizona House of Representatives elections, 2018
• Arizona State Senate elections, 2018

Arkansas

There were 118 seats up for election in Arkansas. A total of 95 incumbents filed for re-election: 21 Democrats, 73 Republicans, and one minor party or independent incumbent. Of that total, 15 incumbents—four Democrats and 11 Republicans—faced contested primaries, representing 15.8% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Arkansas, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	100	17	2	11.8%	63	9	14.3%	81	11	13.6%
Senate	18	4	2	50.0%	10	2	20.0%	14	4	28.6%
Total	118	21	4	19.0%	73	11	15.1%	95	15	15.8%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Arkansas, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	117	42	3	7.1%	22	1	4.5%	64	4	6.3%
2012	135	40	6	15.0%	48	6	12.5%	88	12	13.6%
2014	118	44	1	2.3%	43	7	16.3%	87	8	9.2%
2016	117	36	2	5.6%	66	8	12.1%	102	10	9.8%
2018	118	21	4	19.0%	73	11	15.1%	95	15	15.8%

See also:

• Arkansas House of Representatives elections, 2018
• Arkansas State Senate elections, 2018

California

There were 100 seats up for election in California. A total of 86 incumbents filed for re-election: 59 Democrats and 27 Republicans. Of that total, 37 incumbents—25 Democrats and 12 Republicans—faced contested primaries, representing 43.0% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in California, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	80	51	20	39.2%	22	8	36.4%	73	28	38.4%
Senate	20	8	5	62.5%	5	4	80.0%	13	9	69.2%
Total	100	59	25	42.4%	27	12	44.4%	86	37	43.0%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in California, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	100	44	3	6.8%	18	3	16.7%	62	6	9.7%
2012	100	36	15	41.7%	20	7	35.0%	56	22	39.3%
2014	100	45	19	42.2%	22	4	18.2%	67	23	34.3%
2016	100	51	15	29.4%	23	10	43.5%	74	25	33.8%
2018	100	59	25	42.4%	27	12	44.4%	86	37	43.0%

See also:

• California State Assembly elections, 2018
• California State Senate elections, 2018

Colorado

There were 82 seats up for election in Colorado. A total of 57 incumbents filed for re-election: 27 Democrats and 30 Republicans. Of that total, five incumbents—zero Democrats and five Republicans—faced contested primaries, representing 8.8% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Colorado, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	65	25	0	0.0%	23	4	17.4%	48	4	8.3%
Senate	17	2	0	0.0%	7	1	14.3%	9	1	11.1%
Total	82	27	0	0.0%	30	5	16.7%	57	5	8.8%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Colorado, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	84	37	1	2.7%	26	0	0.0%	64	1	1.6%
2012	85	29	1	3.4%	24	3	12.5%	53	4	7.5%
2014	82	36	0	0.0%	23	2	8.7%	59	2	3.4%
2016	83	26	0	0.0%	33	5	15.2%	59	5	8.5%
2018	82	27	0	0.0%	30	5	16.7%	57	5	8.8%

See also:

• Colorado House of Representatives elections, 2018
• Colorado State Senate elections, 2018

Connecticut

There were 187 seats up for election in Connecticut. A total of 163 incumbents filed for re-election: 84 Democrats and 79 Republicans. Of that total, five incumbents—five Democrats and zero Republicans—faced contested primaries, representing 3.1% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Connecticut, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	151	70	5	7.1%	64	0	0.0%	134	5	3.7%
Senate	36	14	0	0.0%	15	0	0.0%	29	0	0.0%
Total	187	84	5	6.0%	79	0	0.0%	163	5	3.1%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Connecticut, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	187	124	10	8.1%	44	0	0.0%	168	10	6.0%
2012	187	104	6	5.8%	59	1	1.7%	163	7	4.3%
2014	187	105	8	7.6%	58	1	1.7%	163	9	5.5%
2016	187	96	8	8.3%	68	2	2.9%	164	10	6.1%
2018	187	84	5	6.0%	79	0	0.0%	163	5	3.1%

See also:

• Connecticut House of Representatives elections, 2018
• Connecticut State Senate elections, 2018

Delaware

There were 51 seats up for election in Delaware. A total of 37 incumbents filed for re-election: 21 Democrats and 16 Republicans. Of that total, three incumbents—three Democrats and zero Republicans—faced contested primaries, representing 8.1% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Delaware, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	41	19	3	15.8%	12	0	0.0%	31	3	9.7%
Senate	10	2	0	0.0%	4	0	0.0%	6	0	0.0%
Total	51	21	3	14.3%	16	0	0.0%	37	3	8.1%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Delaware, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	52	32	6	18.8%	16	1	6.3%	48	7	14.6%
2012	62	35	6	17.1%	18	5	27.8%	53	11	20.8%
2014	51	31	6	19.4%	18	3	16.7%	49	9	18.4%
2016	52	31	5	16.1%	19	1	5.3%	50	6	12.0%
2018	51	21	3	14.3%	16	0	0.0%	37	3	8.1%

See also:

• Delaware House of Representatives elections, 2018
• Delaware State Senate elections, 2018

Florida

There were 140 seats up for election in Florida. A total of 102 incumbents filed for re-election: 39 Democrats and 63 Republicans. Of that total, 19 incumbents—11 Democrats and eight Republicans—faced contested primaries, representing 18.6% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Florida, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	120	33	8	24.2%	52	6	11.5%	85	14	16.5%
Senate	20	6	3	50.0%	11	2	18.2%	17	5	29.4%
Total	140	39	11	28.2%	63	8	12.7%	102	19	18.6%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Florida, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	143	40	6	15.0%	57	12	21.1%	97	18	18.6%
2012	160	31	7	22.6%	79	24	30.4%	110	31	28.2%
2014	140	43	8	18.6%	79	13	16.5%	122	21	17.2%
2016	160	26	7	26.9%	72	7	9.7%	98	14	14.3%
2018	140	39	11	28.2%	63	8	12.7%	102	19	18.6%

See also:

• Florida House of Representatives elections, 2018
• Florida State Senate elections, 2018

Georgia

There were 236 seats up for election in Georgia. A total of 216 incumbents filed for re-election: 82 Democrats and 134 Republicans. Of that total, 53 incumbents—27 Democrats and 26 Republicans—faced contested primaries, representing 24.5% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Georgia, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	180	63	21	33.3%	100	22	22.0%	163	43	26.4%
Senate	56	19	6	31.6%	34	4	11.8%	53	10	18.9%
Total	236	82	27	32.9%	134	26	19.4%	216	53	24.5%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Georgia, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	236	86	19	22.1%	111	22	19.8%	198	41	20.7%
2012	236	73	25	34.2%	136	23	16.9%	210	48	22.9%
2014	236	74	17	23.0%	144	30	20.8%	219	47	21.5%
2016	236	71	19	26.8%	143	30	21.0%	214	49	22.9%
2018	236	82	27	32.9%	134	26	19.4%	216	53	24.5%

See also:

• Georgia House of Representatives elections, 2018
• Georgia State Senate elections, 2018

Hawaii

There were 63 seats up for election in Hawaii. A total of 54 incumbents filed for re-election: 50 Democrats and four Republicans. Of that total, 23 incumbents—23 Democrats and zero Republicans—faced contested primaries, representing 42.6% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Hawaii, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	51	40	17	42.5%	4	0	0.0%	44	17	38.6%
Senate	12	10	6	60.0%	0	0	#DIV/0!	10	6	60.0%
Total	63	50	23	46.0%	4	0	0.0%	54	23	42.6%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Hawaii, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	66	52	24	46.2%	6	0	0.0%	58	24	41.4%
2012	76	64	24	37.5%	7	2	28.6%	71	26	36.6%
2014	63	52	19	36.5%	6	1	16.7%	58	20	34.5%
2016	64	53	22	41.5%	8	2	25.0%	61	24	39.3%
2018	63	50	23	46.0%	4	0	0.0%	54	23	42.6%

See also:

• Hawaii House of Representatives elections, 2018
• Hawaii State Senate elections, 2018

Idaho

There were 105 seats up for election in Idaho. A total of 89 incumbents filed for re-election: 14 Democrats and 75 Republicans. Of that total, 31 incumbents—one Democrat and 30 Republicans—faced contested primaries, representing 34.8% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Idaho, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	70	8	1	12.5%	50	18	36.0%	58	19	32.8%
Senate	35	6	0	0.0%	25	12	48.0%	31	12	38.7%
Total	105	14	1	7.1%	75	30	40.0%	89	31	34.8%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Idaho, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	105	19	1	5.3%	77	25	32.5%	96	26	27.1%
2012	105	11	1	9.1%	59	33	55.9%	70	34	48.6%
2014	105	15	1	6.7%	79	29	36.7%	94	30	31.9%
2016	105	17	1	5.9%	79	30	38.0%	96	31	32.3%
2018	105	14	1	7.1%	75	30	40.0%	89	31	34.8%

See also:

• Idaho House of Representatives elections, 2018
• Idaho State Senate elections, 2018

Illinois

There were 157 seats up for election in Illinois. A total of 129 incumbents filed for re-election: 77 Democrats and 52 Republicans. Of that total, 17 incumbents—10 Democrats and seven Republicans—faced contested primaries, representing 13.2% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Illinois, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	118	59	8	13.6%	38	7	18.4%	97	15	15.5%
Senate	39	18	2	11.1%	14	0	0.0%	32	2	6.3%
Total	157	77	10	13.0%	52	7	13.5%	129	17	13.2%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Illinois, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	139	76	14	18.4%	51	7	13.7%	127	21	16.5%
2012	177	82	21	25.6%	63	12	19.0%	145	33	22.8%
2014	137	82	9	11.0%	43	5	11.6%	125	14	11.2%
2016	158	92	11	12.0%	52	6	11.5%	144	17	11.8%
2018	157	77	10	13.0%	52	7	13.5%	129	17	13.2%

See also:

• Illinois House of Representatives elections, 2018
• Illinois State Senate elections, 2018

Indiana

There were 125 seats up for election in Indiana. A total of 111 incumbents filed for re-election: 28 Democrats and 83 Republicans. Of that total, 23 incumbents—seven Democrats and 16 Republicans—faced contested primaries, representing 20.7% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Indiana, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	100	25	5	20.0%	63	12	19.0%	88	17	19.3%
Senate	25	3	2	66.7%	20	4	20.0%	23	6	26.1%
Total	125	28	7	25.0%	83	16	19.3%	111	23	20.7%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Indiana, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	125	56	6	10.7%	57	15	26.3%	113	21	18.6%
2012	125	35	5	14.3%	68	12	17.6%	103	17	16.5%
2014	125	36	0	0.0%	81	11	13.6%	117	11	9.4%
2016	125	30	2	6.7%	78	15	19.2%	108	17	15.7%
2018	125	28	7	25.0%	83	16	19.3%	111	23	20.7%

See also:

• Indiana House of Representatives elections, 2018
• Indiana State Senate elections, 2018

Iowa

There were 125 seats up for election in Iowa. A total of 103 incumbents filed for re-election: 48 Democrats and 55 Republicans. Of that total, five incumbents—one Democrat and four Republicans—faced contested primaries, representing 4.9% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Iowa, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	100	37	1	2.7%	47	2	4.3%	84	3	3.6%
Senate	25	11	0	0.0%	8	2	25.0%	19	2	10.5%
Total	125	48	1	2.1%	55	4	7.3%	103	5	4.9%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Iowa, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	125	65	5	7.7%	43	3	7.0%	108	8	7.4%
2012	126	45	0	0.0%	55	16	29.1%	100	16	16.0%
2014	125	55	3	5.5%	55	5	9.1%	110	8	7.3%
2016	125	50	4	8.0%	62	5	8.1%	112	9	8.0%
2018	125	48	1	2.1%	55	4	7.3%	103	5	4.9%

See also:

• Iowa House of Representatives elections, 2018
• Iowa State Senate elections, 2018

Kansas

There were 125 seats up for election in Kansas. A total of 112 incumbents filed for re-election: 40 Democrats and 72 Republicans. Of that total, 26 incumbents—seven Democrats and 19 Republicans—faced contested primaries, representing 23.2% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Kansas, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	125	40	7	17.5%	72	19	26.4%	112	26	23.2%
Senate	Did not hold elections
Total	125	40	7	17.5%	72	19	26.4%	112	26	23.2%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Kansas, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	125	45	3	6.7%	70	20	28.6%	115	23	20.0%
2012	165	37	6	16.2%	90	48	53.3%	127	54	42.5%
2014	125	29	0	0.0%	83	21	25.3%	112	21	18.8%
2016	165	34	4	11.8%	98	35	35.7%	132	39	29.5%
2018	125	40	7	17.5%	72	19	26.4%	112	26	23.2%

See also:

• Kansas House of Representatives elections, 2018

Kentucky

There were 119 seats up for election in Kentucky. A total of 98 incumbents filed for re-election: 29 Democrats and 69 Republicans. Of that total, 19 incumbents—four Democrats and 15 Republicans—faced contested primaries, representing 19.4% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Kentucky, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	100	26	3	11.5%	54	11	20.4%	80	14	17.5%
Senate	19	3	1	33.3%	15	4	26.7%	18	5	27.8%
Total	119	29	4	13.8%	69	15	21.7%	98	19	19.4%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Kentucky, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	119	68	11	16.2%	43	10	23.3%	112	21	18.8%
2012	119	64	11	17.2%	42	11	26.2%	106	22	20.8%
2014	119	55	6	10.9%	53	9	17.0%	108	15	13.9%
2016	119	57	7	12.3%	52	9	17.3%	109	16	14.7%
2018	119	29	4	13.8%	69	15	21.7%	98	19	19.4%

See also:

• Kentucky House of Representatives elections, 2018
• Kentucky State Senate elections, 2018

Maine

There were 186 seats up for election in Maine. A total of 130 incumbents filed for re-election: 74 Democrats, 53 Republicans, and three minor party or independent incumbents. Of that total, two incumbents—two Democrats and zero Republicans—faced contested primaries, representing 1.5% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Maine, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	151	59	2	3.4%	45	0	0.0%	107	2	1.9%
Senate	35	15	0	0.0%	8	0	0.0%	23	0	0.0%
Total	186	74	2	2.7%	53	0	0.0%	130	2	1.5%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Maine, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	186	94	3	3.2%	49	1	2.0%	143	4	2.8%
2012	186	54	4	7.4%	67	1	1.5%	123	5	4.1%
2014	186	85	2	2.4%	48	1	2.1%	137	3	2.2%
2016	186	69	2	2.9%	80	2	2.5%	149	4	2.7%
2018	186	74	2	2.7%	53	0	0.0%	130	2	1.5%

See also:

• Maine House of Representatives elections, 2018
• Maine State Senate elections, 2018

Maryland

There were 188 seats up for election in Maryland. A total of 149 incumbents filed for re-election: 95 Democrats and 54 Republicans. Of that total, 107 incumbents—81 Democrats and 26 Republicans—faced contested primaries, representing 71.8% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Maryland, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	141	71	67	94.4%	41	23	56.1%	112	90	80.4%
Senate	47	24	14	58.3%	13	3	23.1%	37	17	45.9%
Total	188	95	81	85.3%	54	26	48.1%	149	107	71.8%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Maryland, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	188	121	78	64.5%	41	27	65.9%	162	105	64.8%
2012	Did not hold elections.
2014	188	101	70	69.3%	37	24	64.9%	138	94	68.1%
2016	Did not hold elections.
2018	188	95	81	85.3%	54	26	48.1%	149	107	71.8%

See also:

• Maryland House of Delegates elections, 2018
• Maryland State Senate elections, 2018

Massachusetts

There were 200 seats up for election in Massachusetts. A total of 176 incumbents filed for re-election: 137 Democrats, 37 Republicans, and two minor party or independent incumbents. Of that total, 20 incumbents—19 Democrats and one Republican—faced contested primaries, representing 11.4% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Massachusetts, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	160	108	16	14.8%	30	1	3.3%	140	17	12.1%
Senate	40	29	3	10.3%	7	0	0.0%	36	3	8.3%
Total	200	137	19	13.9%	37	1	2.7%	176	20	11.4%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Massachusetts, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	200	151	14	9.3%	15	0	0.0%	166	14	8.4%
2012	200	154	18	11.7%	36	1	2.8%	190	19	10.0%
2014	200	148	16	10.8%	30	1	3.3%	178	17	9.6%
2016	200	147	19	12.9%	40	1	2.5%	187	20	10.7%
2018	200	137	19	13.9%	37	1	2.7%	176	20	11.4%

See also:

• Massachusetts House of Representatives elections, 2018
• Massachusetts State Senate elections, 2018

Michigan

There were 148 seats up for election in Michigan. A total of 78 incumbents filed for re-election: 32 Democrats and 46 Republicans. Of that total, 23 incumbents—14 Democrats and nine Republicans—faced contested primaries, representing 29.5% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Michigan, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	110	29	13	44.8%	38	7	18.4%	67	20	29.9%
Senate	38	3	1	33.3%	8	2	25.0%	11	3	27.3%
Total	148	32	14	43.8%	46	9	19.6%	78	23	29.5%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Michigan, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	148	40	10	25.0%	28	7	25.0%	68	17	25.0%
2012	110	36	19	52.8%	56	18	32.1%	92	37	40.2%
2014	148	40	9	22.5%	57	19	33.3%	97	28	28.9%
2016	110	32	14	43.8%	36	9	25.0%	68	23	33.8%
2018	148	32	14	43.8%	46	9	19.6%	78	23	29.5%

See also:

• Michigan House of Representatives elections, 2018
• Michigan State Senate elections, 2018

Minnesota

There were 134 seats up for election in Minnesota. A total of 111 incumbents filed for re-election: 41 Democrats and 70 Republicans. Of that total, seven incumbents—five Democrats and two Republicans—faced contested primaries, representing 6.3% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Minnesota, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	134	41	5	12.2%	70	2	2.9%	111	7	6.3%
Senate	Did not hold elections.
Total	134	41	5	12.2%	70	2	2.9%	111	7	6.3%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Minnesota, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	201	121	5	4.1%	56	3	5.4%	177	8	4.5%
2012	201	72	7	9.7%	82	4	4.9%	154	11	7.1%
2014	134	68	4	5.9%	51	1	2.0%	119	5	4.2%
2016	201	82	7	8.5%	91	4	4.4%	173	11	6.4%
2018	134	41	5	12.2%	70	2	2.9%	111	7	6.3%

See also:

• Minnesota House of Representatives elections, 2018

Missouri

There were 180 seats up for election in Missouri. A total of 117 incumbents filed for re-election: 34 Democrats and 83 Republicans. Of that total, 19 incumbents—seven Democrats and 12 Republicans—faced contested primaries, representing 16.2% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Missouri, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	163	32	6	18.8%	76	11	14.5%	108	17	15.7%
Senate	17	2	1	50.0%	7	1	14.3%	9	2	22.2%
Total	180	34	7	20.6%	83	12	14.5%	117	19	16.2%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Missouri, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	180	55	8	14.5%	50	7	14.0%	105	15	14.3%
2012	180	43	19	44.2%	83	16	19.3%	126	35	27.8%
2014	180	47	8	17.0%	100	14	14.0%	147	22	15.0%
2016	180	35	7	20.0%	106	14	13.2%	142	21	14.8%
2018	180	34	7	20.6%	83	12	14.5%	117	19	16.2%

See also:

• Missouri House of Representatives elections, 2018
• Missouri State Senate elections, 2018

Montana

There were 125 seats up for election in Montana. A total of 89 incumbents filed for re-election: 34 Democrats and 55 Republicans. Of that total, 10 incumbents—one Democrat and nine Republicans—faced contested primaries, representing 11.2% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Montana, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	100	28	1	3.6%	44	6	13.6%	72	7	9.7%
Senate	25	6	0	0.0%	11	3	27.3%	17	3	17.6%
Total	125	34	1	2.9%	55	9	16.4%	89	10	11.2%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Montana, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	126	34	3	8.8%	41	8	19.5%	75	11	14.7%
2012	126	26	3	11.5%	56	14	25.0%	82	17	20.7%
2014	125	32	3	9.4%	48	15	31.3%	80	18	22.5%
2016	125	36	1	2.8%	44	13	29.5%	80	14	17.5%
2018	125	34	1	2.9%	55	9	16.4%	89	10	11.2%

See also:

• Montana House of Representatives elections, 2018
• Montana State Senate elections, 2018

Nebraska

There were 24 seats up for election in Nebraska. A total of 16 incumbents filed for re-election: three Democrats, 12 Republicans, and one minor party or independent incumbent. Of that total, five incumbents—zero Democrats, four Republicans, and one minor party or independent incumbent—faced contested primaries, representing 31.3% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Nebraska, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	N/A
Senate	24	3	0	0.0%	12	4	33.3%	16	5	31.3%
Total	24	3	0	0.0%	12	4	33.3%	16	5	31.3%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Nebraska, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	24	10	4	40.0%	10	1	10.0%	21	6	28.6%
2012	25	6	2	33.3%	10	2	20.0%	16	4	25.0%
2014	24	2	0	0.0%	5	1	20.0%	7	1	14.3%
2016	25	4	2	50.0%	9	1	11.1%	14	4	28.6%
2018	24	3	0	0.0%	12	4	33.3%	16	5	31.3%

See also:

• Nebraska State Senate elections, 2018

Nevada

There were 53 seats up for election in Nevada. A total of 38 incumbents filed for re-election: 24 Democrats and 14 Republicans. Of that total, eight incumbents—three Democrats and five Republicans—faced contested primaries, representing 21.1% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Nevada, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	42	21	2	9.5%	11	4	36.4%	32	6	18.8%
Senate	11	3	1	33.3%	3	1	33.3%	6	2	33.3%
Total	53	24	3	12.5%	14	5	35.7%	38	8	21.1%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Nevada, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	53	17	1	5.9%	9	4	44.4%	26	5	19.2%
2012	52	24	10	41.7%	12	2	16.7%	36	12	33.3%
2014	53	26	5	19.2%	17	8	47.1%	43	13	30.2%
2016	52	21	6	28.6%	19	11	57.9%	41	17	41.5%
2018	53	24	3	12.5%	14	5	35.7%	38	8	21.1%

See also:

• Nevada State Assembly elections, 2018
• Nevada State Senate elections, 2018

New Hampshire

There were 424 seats up for election in New Hampshire. A total of 320 incumbents filed for re-election: 147 Democrats, 170 Republicans, and three minor party or independent incumbents. Of that total, 87 incumbents—30 Democrats and 57 Republicans—faced contested primaries, representing 27.2% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in New Hampshire, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	400	138	30	21.7%	157	55	35.0%	298	85	28.5%
Senate	24	9	0	0.0%	13	2	15.4%	22	2	9.1%
Total	424	147	30	20.4%	170	57	33.5%	320	87	27.2%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in New Hampshire, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	424	178	45	25.3%	144	79	54.9%	322	124	38.5%
2012	424	85	14	16.5%	230	131	57.0%	315	145	46.0%
2014	424	170	24	14.1%	143	80	55.9%	313	104	33.2%
2016	424	128	25	19.5%	179	100	55.9%	307	125	40.7%
2018	424	147	30	20.4%	170	57	33.5%	320	87	27.2%

See also:

• New Hampshire House of Representatives elections, 2018
• New Hampshire State Senate elections, 2018

New Mexico

There were 70 seats up for election in New Mexico. A total of 61 incumbents filed for re-election: 35 Democrats and 26 Republicans. Of that total, six incumbents—five Democrats and one Republican—faced contested primaries, representing 9.8% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in New Mexico, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	70	35	5	14.3%	26	1	3.8%	61	6	9.8%
Senate	Did not hold elections
Total	70	35	5	14.3%	26	1	3.8%	61	6	9.8%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in New Mexico, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	70	44	10	22.7%	23	4	17.4%	67	14	20.9%
2012	112	50	19	38.0%	40	5	12.5%	91	24	26.4%
2014	70	31	5	16.1%	28	2	7.1%	59	7	11.9%
2016	112	52	9	17.3%	50	0	0.0%	102	9	8.8%
2018	70	35	5	14.3%	26	1	3.8%	61	6	9.8%

See also:

• New Mexico House of Representatives elections, 2018

New York

There were 213 seats up for election in New York. A total of 195 incumbents filed for re-election: 131 Democrats and 64 Republicans. Of that total, 31 incumbents—27 Democrats and four Republicans—faced contested primaries, representing 15.9% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in New York, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	150	99	15	15.2%	38	4	10.5%	137	19	13.9%
Senate	63	32	12	37.5%	26	0	0.0%	58	12	20.7%
Total	213	131	27	20.6%	64	4	6.3%	195	31	15.9%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in New York, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	212	128	35	27.3%	59	2	3.4%	187	37	19.8%
2012	213	118	24	20.3%	71	9	12.7%	189	33	17.5%
2014	213	126	22	17.5%	66	5	7.6%	192	27	14.1%
2016	213	129	28	21.7%	65	5	7.7%	194	33	17.0%
2018	213	131	27	20.6%	64	4	6.3%	195	31	15.9%

See also:

• New York State Assembly elections, 2018
• New York State Senate elections, 2018

North Carolina

There were 170 seats up for election in North Carolina. A total of 153 incumbents filed for re-election: 57 Democrats and 96 Republicans. Of that total, 39 incumbents—11 Democrats and 28 Republicans—faced contested primaries, representing 25.5% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in North Carolina, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	120	42	8	19.0%	66	19	28.8%	108	27	25.0%
Senate	50	15	3	20.0%	30	9	30.0%	45	12	26.7%
Total	170	57	11	19.3%	96	28	29.2%	153	39	25.5%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in North Carolina, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	170	88	24	27.3%	64	15	23.4%	152	39	25.7%
2012	170	50	15	30.0%	77	22	28.6%	127	37	29.1%
2014	170	54	9	16.7%	102	20	19.6%	156	29	18.6%
2016	170	57	13	22.8%	93	18	19.4%	150	31	20.7%
2018	170	57	11	19.3%	96	28	29.2%	153	39	25.5%

See also:

• North Carolina House of Representatives elections, 2018
• North Carolina State Senate elections, 2018

North Dakota

There were 72 seats up for election in North Dakota. A total of 60 incumbents filed for re-election: 11 Democrats and 49 Republicans. Of that total, six incumbents—zero Democrats and six Republicans—faced contested primaries, representing 10.0% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in North Dakota, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	48	7	0	0.0%	34	6	17.6%	41	6	14.6%
Senate	24	4	0	0.0%	15	0	0.0%	19	0	0.0%
Total	72	11	0	0.0%	49	6	12.2%	60	6	10.0%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in North Dakota, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	72	24	2	8.3%	33	0	0.0%	57	2	3.5%
2012	75	18	0	0.0%	43	10	23.3%	61	10	16.4%
2014	72	10	0	0.0%	49	4	8.2%	59	4	6.8%
2016	69	21	0	0.0%	33	7	21.2%	54	7	13.0%
2018	72	11	0	0.0%	49	6	12.2%	60	6	10.0%

See also:

• North Dakota House of Representatives elections, 2018
• North Dakota State Senate elections, 2018

Ohio

There were 116 seats up for election in Ohio. A total of 74 incumbents filed for re-election: 25 Democrats and 49 Republicans. Of that total, 20 incumbents—six Democrats and 14 Republicans—faced contested primaries, representing 27.0% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Ohio, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	99	22	3	13.6%	45	12	26.7%	67	15	22.4%
Senate	17	3	3	100.0%	4	2	50.0%	7	5	71.4%
Total	116	25	6	24.0%	49	14	28.6%	74	20	27.0%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Ohio, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	116	47	6	12.8%	40	8	20.0%	87	14	16.1%
2012	117	36	6	16.7%	62	8	12.9%	98	14	14.3%
2014	116	31	4	12.9%	59	19	32.2%	90	23	25.6%
2016	115	28	4	14.3%	58	10	17.2%	86	14	16.3%
2018	116	25	6	24.0%	49	14	28.6%	74	20	27.0%

See also:

• Ohio House of Representatives elections, 2018
• Ohio State Senate elections, 2018

Oklahoma

There were 125 seats up for election in Oklahoma. A total of 82 incumbents filed for re-election: 22 Democrats and 60 Republicans. Of that total, 37 incumbents—two Democrats and 35 Republicans—faced contested primaries, representing 45.1% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Oklahoma, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	101	19	2	10.5%	50	29	58.0%	69	31	44.9%
Senate	24	3	0	0.0%	10	6	60.0%	13	6	46.2%
Total	125	22	2	9.1%	60	35	58.3%	82	37	45.1%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Oklahoma, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	125	41	5	12.2%	62	7	11.3%	103	12	11.7%
2012	125	30	2	6.7%	72	17	23.6%	102	19	18.6%
2014	125	25	1	4.0%	70	12	17.1%	95	13	13.7%
2016	125	20	4	20.0%	64	24	37.5%	84	28	33.3%
2018	125	22	2	9.1%	60	35	58.3%	82	37	45.1%

See also:

• Oklahoma House of Representatives elections, 2018
• Oklahoma State Senate elections, 2018

Oregon

There were 73 seats up for election in Oregon. A total of 65 incumbents filed for re-election: 42 Democrats and 23 Republicans. Of that total, nine incumbents—four Democrats and five Republicans—faced contested primaries, representing 13.8% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Oregon, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	58	32	2	6.3%	19	5	26.3%	51	7	13.7%
Senate	15	10	2	20.0%	4	0	0.0%	14	2	14.3%
Total	73	42	4	9.5%	23	5	21.7%	65	9	13.8%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Oregon, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	76	44	2	4.5%	25	7	28.0%	69	9	13.0%
2012	76	31	1	3.2%	35	3	8.6%	66	4	6.1%
2014	75	38	3	7.9%	22	3	13.6%	60	6	10.0%
2016	75	30	2	6.7%	28	2	7.1%	58	4	6.9%
2018	73	42	4	9.5%	23	5	21.7%	65	9	13.8%

See also:

• Oregon House of Representatives elections, 2018
• Oregon State Senate elections, 2018

Pennsylvania

There were 228 seats up for election in Pennsylvania. A total of 196 incumbents filed for re-election: 82 Democrats and 114 Republicans. Of that total, 22 incumbents—14 Democrats and eight Republicans—faced contested primaries, representing 11.2% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Pennsylvania, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	203	75	14	18.7%	100	7	7.0%	175	21	12.0%
Senate	25	7	0	0.0%	14	1	7.1%	21	1	4.8%
Total	228	82	14	17.1%	114	8	7.0%	196	22	11.2%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Pennsylvania, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	228	100	20	20.0%	107	9	8.4%	207	29	14.0%
2012	228	88	17	19.3%	115	15	13.0%	203	32	15.8%
2014	228	95	30	31.6%	108	12	11.1%	203	42	20.7%
2016	228	89	19	21.3%	120	9	7.5%	209	28	13.4%
2018	228	82	14	17.1%	114	8	7.0%	196	22	11.2%

See also:

• Pennsylvania House of Representatives elections, 2018
• Pennsylvania State Senate elections, 2018

Rhode Island

There were 113 seats up for election in Rhode Island. A total of 98 incumbents filed for re-election: 86 Democrats and 12 Republicans. Of that total, 20 incumbents—20 Democrats and zero Republicans—faced contested primaries, representing 20.4% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Rhode Island, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	75	56	12	21.4%	9	0	0.0%	65	12	18.5%
Senate	38	30	8	26.7%	3	0	0.0%	33	8	24.2%
Total	113	86	20	23.3%	12	0	0.0%	98	20	20.4%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Rhode Island, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	113	88	32	36.4%	9	2	22.2%	98	34	34.7%
2012	113	84	24	28.6%	15	2	13.3%	100	26	26.0%
2014	113	95	18	18.9%	9	0	0.0%	105	18	17.1%
2016	113	91	18	19.8%	13	0	0.0%	105	18	17.1%
2018	113	86	20	23.3%	12	0	0.0%	98	20	20.4%

See also:

• Rhode Island House of Representatives elections, 2018
• Rhode Island State Senate elections, 2018

South Carolina

There were 124 seats up for election in South Carolina. A total of 116 incumbents filed for re-election: 42 Democrats and 74 Republicans. Of that total, 36 incumbents—11 Democrats and 25 Republicans—faced contested primaries, representing 31.0% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in South Carolina, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	124	42	11	26.2%	74	25	33.8%	116	36	31.0%
Senate	Did not hold elections
Total	124	42	11	26.2%	74	25	33.8%	116	36	31.0%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in South Carolina, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	124	48	11	22.9%	64	15	23.4%	112	26	23.2%
2012	170	57	7	12.3%	91	16	17.6%	148	23	15.5%
2014	124	42	5	11.9%	73	15	20.5%	115	20	17.4%
2016	170	57	14	24.6%	96	28	29.2%	153	42	27.5%
2018	124	42	11	26.2%	74	25	33.8%	116	36	31.0%

See also:

• South Carolina House of Representatives elections, 2018

South Dakota

There were 105 seats up for election in South Dakota. A total of 79 incumbents filed for re-election: nine Democrats and 70 Republicans. Of that total, 20 incumbents—three Democrats and 17 Republicans—faced contested primaries, representing 25.3% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in South Dakota, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	70	6	3	50.0%	46	12	26.1%	52	15	28.8%
Senate	35	3	0	0.0%	24	5	20.8%	27	5	18.5%
Total	105	9	3	33.3%	70	17	24.3%	79	20	25.3%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in South Dakota, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	105	26	3	11.5%	45	4	8.9%	71	7	9.9%
2012	105	15	3	20.0%	59	22	37.3%	74	25	33.8%
2014	105	16	2	12.5%	58	15	25.9%	74	17	23.0%
2016	105	10	0	0.0%	53	18	34.0%	63	18	28.6%
2018	105	9	3	33.3%	70	17	24.3%	79	20	25.3%

See also:

• South Dakota House of Representatives elections, 2018
• South Dakota State Senate elections, 2018

Tennessee

There were 116 seats up for election in Tennessee. A total of 89 incumbents filed for re-election: 20 Democrats and 69 Republicans. Of that total, 24 incumbents—seven Democrats and 17 Republicans—faced contested primaries, representing 27.0% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Tennessee, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	99	18	6	33.3%	57	16	28.1%	75	22	29.3%
Senate	17	2	1	50.0%	12	1	8.3%	14	2	14.3%
Total	116	20	7	35.0%	69	17	24.6%	89	24	27.0%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Tennessee, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	116	54	6	11.1%	51	6	11.8%	106	12	11.3%
2012	115	30	11	36.7%	67	24	35.8%	98	35	35.7%
2014	116	29	5	17.2%	75	20	26.7%	104	25	24.0%
2016	115	26	8	30.8%	83	26	31.3%	109	34	31.2%
2018	116	20	7	35.0%	69	17	24.6%	89	24	27.0%

See also:

• Tennessee House of Representatives elections, 2018
• Tennessee State Senate elections, 2018

Texas

There were 165 seats up for election in Texas. A total of 151 incumbents filed for re-election: 57 Democrats and 94 Republicans. Of that total, 50 incumbents—17 Democrats and 33 Republicans—faced contested primaries, representing 33.1% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Texas, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	150	54	16	29.6%	83	27	32.5%	137	43	31.4%
Senate	15	3	1	33.3%	11	6	54.5%	14	7	50.0%
Total	165	57	17	29.8%	94	33	35.1%	151	50	33.1%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Texas, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	166	75	8	10.7%	82	20	24.4%	157	28	17.8%
2012	181	53	8	15.1%	94	43	45.7%	147	51	34.7%
2014	165	57	11	19.3%	93	28	30.1%	150	39	26.0%
2016	166	54	13	24.1%	95	33	34.7%	150	46	30.7%
2018	165	57	17	29.8%	94	33	35.1%	151	50	33.1%

See also:

• Texas House of Representatives elections, 2018
• Texas State Senate elections, 2018

Utah

There were 89 seats up for election in Utah. A total of 65 incumbents filed for re-election: 14 Democrats and 51 Republicans. Of that total, three incumbents—zero Democrats and three Republicans—faced contested primaries, representing 4.6% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Utah, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	75	11	0	0.0%	46	3	6.5%	57	3	5.3%
Senate	14	3	0	0.0%	5	0	0.0%	8	0	0.0%
Total	89	14	0	0.0%	51	3	5.9%	65	3	4.6%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Utah, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	90	27	1	3.7%	54	8	14.8%	81	9	11.1%
2012	91	17	2	11.8%	61	12	19.7%	78	14	17.9%
2014	89	13	0	0.0%	64	4	6.3%	77	4	5.2%
2016	90	13	0	0.0%	63	6	9.5%	76	6	7.9%
2018	89	14	0	0.0%	51	3	5.9%	65	3	4.6%

See also:

• Utah House of Representatives elections, 2018
• Utah State Senate elections, 2018

Vermont

There were 180 seats up for election in Vermont. A total of 148 incumbents filed for re-election: 88 Democrats, 44 Republicans, and 16 minor party or independent incumbents. Of that total, 19 incumbents—15 Democrats and four Republicans—faced contested primaries, representing 12.8% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Vermont, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	150	69	5	7.2%	39	2	5.1%	122	7	5.7%
Senate	30	19	10	52.6%	5	2	40.0%	26	12	46.2%
Total	180	88	15	17.0%	44	4	9.1%	148	19	12.8%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Vermont, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	180	107	8	7.5%	47	5	10.6%	159	13	8.2%
2012	180	105	11	10.5%	45	1	2.2%	155	12	7.7%
2014	180	105	5	4.8%	45	3	6.7%	153	8	5.2%
2016	180	88	23	26.1%	58	4	6.9%	152	27	17.8%
2018	180	88	15	17.0%	44	4	9.1%	148	19	12.8%

See also:

• Vermont House of Representatives elections, 2018
• Vermont State Senate elections, 2018

Washington

There were 123 seats up for election in Washington. A total of 106 incumbents filed for re-election: 59 Democrats and 47 Republicans. Of that total, 34 incumbents—16 Democrats and 18 Republicans—faced contested primaries, representing 32.1% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Washington, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	98	46	9	19.6%	38	13	34.2%	84	22	26.2%
Senate	25	13	7	53.8%	9	5	55.6%	22	12	54.5%
Total	123	59	16	27.1%	47	18	38.3%	106	34	32.1%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Washington, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	123	65	21	32.3%	38	3	7.9%	103	24	23.3%
2012	124	53	10	18.9%	45	5	11.1%	98	15	15.3%
2014	123	63	15	23.8%	48	8	16.7%	111	23	20.7%
2016	124	52	16	30.8%	51	16	31.4%	103	32	31.1%
2018	123	59	16	27.1%	47	18	38.3%	106	34	32.1%

See also:

• Washington House of Representatives elections, 2018
• Washington State Senate elections, 2018

West Virginia

There were 117 seats up for election in West Virginia. A total of 99 incumbents filed for re-election: 38 Democrats, 60 Republicans, and one minor party or independent incumbent. Of that total, 40 incumbents—15 Democrats and 25 Republicans—faced contested primaries, representing 40.4% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in West Virginia, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	100	32	15	46.9%	49	21	42.9%	82	36	43.9%
Senate	17	6	0	0.0%	11	4	36.4%	17	4	23.5%
Total	117	38	15	39.5%	60	25	41.7%	99	40	40.4%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in West Virginia, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	117	76	46	60.5%	27	6	22.2%	103	52	50.5%
2012	117	66	37	56.1%	32	8	25.0%	98	45	45.9%
2014	117	60	19	31.7%	46	15	32.6%	106	34	32.1%
2016	117	35	20	57.1%	58	18	31.0%	93	38	40.9%
2018	117	38	15	39.5%	60	25	41.7%	99	40	40.4%

See also:

• West Virginia House of Delegates elections, 2018
• West Virginia State Senate elections, 2018

Wisconsin

There were 116 seats up for election in Wisconsin. A total of 100 incumbents filed for re-election: 37 Democrats and 63 Republicans. Of that total, four incumbents—three Democrats and one Republican—faced contested primaries, representing 4.0% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Wisconsin, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	99	31	3	9.7%	55	1	1.8%	86	4	4.7%
Senate	17	6	0	0.0%	8	0	0.0%	14	0	0.0%
Total	116	37	3	8.1%	63	1	1.6%	100	4	4.0%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Wisconsin, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	116	52	6	11.5%	40	7	17.5%	93	13	14.0%
2012	115	36	9	25.0%	58	6	10.3%	94	15	16.0%
2014	116	36	2	5.6%	51	1	2.0%	87	3	3.4%
2016	115	39	8	20.5%	63	0	0.0%	102	8	7.8%
2018	116	37	3	8.1%	63	1	1.6%	100	4	4.0%

See also:

• Wisconsin State Assembly elections, 2018
• Wisconsin State Senate elections, 2018

Wyoming

There were 75 seats up for election in Wyoming. A total of 65 incumbents filed for re-election: nine Democrats and 56 Republicans. Of that total, 19 incumbents—zero Democrats and 19 Republicans—faced contested primaries, representing 29.2% of incumbents who filed for re-election.

In 2018

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Wyoming, 2018
Chamber	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
House	60	7	0	0.0%	46	14	30.4%	53	14	26.4%
Senate	15	2	0	0.0%	10	5	50.0%	12	5	41.7%
Total	75	9	0	0.0%	56	19	33.9%	65	19	29.2%

2010-2018

Historical statistics are shown below. Hover over column headings to learn more about their contents.

State legislative incumbents in contested primaries in Wyoming, 2010-2018
Year	Seats
		Democratic			Republican			Total
		Filed	Cont.	%	Filed	Cont.	%	Filed	Cont.	%
2010	75	18	0	0.0%	42	15	35.7%	60	15	25.0%
2012	75	9	0	0.0%	51	21	41.2%	60	21	35.0%
2014	75	9	0	0.0%	55	26	47.3%	64	26	40.6%
2016	75	9	0	0.0%	46	20	43.5%	55	20	36.4%
2018	75	9	0	0.0%	56	19	33.9%	65	19	29.2%

See also:

• Wyoming House of Representatives elections, 2018
• Wyoming State Senate elections, 2018

Terms and definitions

Incumbent

See also: Incumbent

Ballotpedia defines incumbency by chamber. Under this definition, if an incumbent in House District 1 filed for re-election in House District 2, they would still be counted as an incumbent due to their remaining in the same chamber even though they ran for a different seat. If an incumbent in House District 1 filed to run in Senate District 2, they would not be counted as an incumbent in the Senate race since they are coming from a different chamber.

Ballotpedia uses the term re-elect to refer to any incumbent who is running in an election to retain their office, including incumbents who were originally appointed to their position.

Contested primary

See also: Primary election

A contested primary is one where there are more candidates running than nominations available, meaning at least one candidate on the primary ballot must lose.

The number of candidates needed to create a contested primary depends on the primary system in place and the number of seats up for election in a state legislative district.

In states with partisan primaries, a primary is typically contested when two or more candidates from the same political party file to run since only one candidate can receive their party's nomination. In states with multi-member state legislative districts, the number of candidates a party can nominate to the general election ballot depends on the number of seats in the district. In these cases, a primary is contested when at least one more candidate files to run than there are seats in the district. In states with top-two/four primaries, a primary is contested when more than two (in states with a top-two system) or more than four (in states with a top-four system) candidates file to run.

Methodology

Counting incumbents in contested primaries

An incumbent is counted as facing a contested primary when there is a chance that incumbent could lose to a primary challenger. Each incumbent is counted individually.

Typically, in a single-member district, this means the incumbent filed for re-election and faced one or more primary challengers.

But in states with multi-member districts, several incumbents might be seeking re-election. If such a primary becomes contested, every incumbent running for re-election is counted as facing a contested primary even if it is not possible for every incumbent to lose.

For example, in a district with two seats where two Democratic incumbents file for re-election, if a third Democrat joins the primary, both of the Democratic incumbents are counted as facing a contested primary even though the third primary challenger can only potentially defeat one.

In the event of an incumbent v. incumbent primary, where there are more incumbents running in the primary than nominations available, every incumbent present is counted as facing a contested primary.

Candidacy withdrawals

See also: Signature requirements and deadlines for 2018 state government elections

In order to have their names printed on election ballots, candidates must submit information prior to a filing deadline. Filing deadlines are the dates by which candidates must submit required paperwork to state election administrators.

For major party candidates, filing deadlines always precede primaries. However, candidates may choose to withdraw before the primary takes place. Withdrawals include decisions to leave the race, disqualifications, and deaths. These withdrawals are either official or unofficial.

An official withdrawal means the candidate withdrew before a specific date set in state law and their name was removed from the primary ballot. If an incumbent officially withdrew before the primary, they are not included in any of the totals of this analysis, unless they later re-entered the race as a minor party or independent candidate.

An unofficial withdrawal means the candidate withdrew after a specific date set in state law, typically after ballots have been printed, meaning their name remains on the ballot even though they are not actively campaigning. If an incumbent unofficially withdrew, they are included in the totals of this analysis.

Minor party and independent incumbents

Minor party and independent incumbents typically do not participate in primaries in the same way major party incumbents might.

For minor party incumbents, nominations are normally carried out via conventions, which are limited to a smaller number of voting delegates. Ballotpedia does not count conventions as primaries.

Independent incumbents normally do not participate in primaries, qualifying instead for the general election ballot directly.

If a minor party or independent incumbent participates in a contested primary (partisan or top-two/four), they are included in the total number of incumbents in contested primaries.

All minor party or independent incumbents who have filed for re-election are included in the total number of incumbents running at the time of the primary even if the filing deadline was later than the primary date.

Convention defeats

If an incumbent is defeated in a convention and did not appear in any later elections, that incumbent is still included in the total number of incumbents who filed for re-election even though they were not running at the time of the primary.

See also

• State legislative elections, 2018
  • Impact of term limits on state legislative elections in 2018
  • Open seats in state legislative elections, 2018
  • Contested state legislative primaries, 2018
  • Major party competition in state legislative elections, 2018
  • State legislative incumbents without general election challengers, 2018
  • Incumbents defeated in state legislative elections, 2018
• Primary election competitiveness in state and federal government, 2018

Footnotes

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