California's 10th Congressional District

California's 10th Congressional District

Incumbent

Mark DeSaulnier

Assumed office: January 3, 2023

California's 10th Congressional District in the United States House of Representatives is represented by Mark DeSaulnier (D).

As of the 2020 Census, California representatives represented an average of 761,091 residents. After the 2010 Census, each member represented 704,566 residents.

Elections

2024

See also: California's 10th Congressional District election, 2024

California's 10th Congressional District election, 2024 (March 5 top-two primary)

General election

General election for U.S. House California District 10

Incumbent Mark DeSaulnier defeated Katherine Piccinini in the general election for U.S. House California District 10 on November 5, 2024.

		Candidate	%	Votes
✔		Mark DeSaulnier (D)	66.5	242,325
		Katherine Piccinini (R)	33.5	122,219

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 364,544
= candidate completed the Ballotpedia Candidate Connection survey.
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Nonpartisan primary election

Nonpartisan primary for U.S. House California District 10

Incumbent Mark DeSaulnier and Katherine Piccinini defeated Nolan Chen, Joe Sweeney, and Mohamed Elsherbini in the primary for U.S. House California District 10 on March 5, 2024.

		Candidate	%	Votes
✔		Mark DeSaulnier (D)	65.5	121,334
✔		Katherine Piccinini (R)	18.9	34,900
		Nolan Chen (R)	10.5	19,465
		Joe Sweeney (No party preference)	4.1	7,609
		Mohamed Elsherbini (No party preference)	1.0	1,825

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 185,133
= candidate completed the Ballotpedia Candidate Connection survey.
If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey.
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Withdrawn or disqualified candidates

• Calvin Nguyen (D)
• Musa Jalis (R)

2022

See also: California's 10th Congressional District election, 2022

General election

General election for U.S. House California District 10

Incumbent Mark DeSaulnier defeated Michael Ernest Kerr in the general election for U.S. House California District 10 on November 8, 2022.

		Candidate	%	Votes
✔		Mark DeSaulnier (D)	78.9	198,415
		Michael Ernest Kerr (G)	21.1	52,965

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 251,380
= candidate completed the Ballotpedia Candidate Connection survey.
If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey.
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Nonpartisan primary election

Nonpartisan primary for U.S. House California District 10

Incumbent Mark DeSaulnier and Michael Ernest Kerr defeated Katherine Piccinini in the primary for U.S. House California District 10 on June 7, 2022.

		Candidate	%	Votes
✔		Mark DeSaulnier (D)	84.0	124,787
✔		Michael Ernest Kerr (G)	14.9	22,210
		Katherine Piccinini (R) (Write-in)	1.1	1,638

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 148,635
= candidate completed the Ballotpedia Candidate Connection survey.
If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey.
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Withdrawn or disqualified candidates

• Oleksii Chuiko (R)
• Sean Harrison (R)
• Simon Aslanpour (R)
• Ricky Gill (R)
• Angelina Sigala (D)
• Eugene Kilbride (R)

2020

See also: California's 10th Congressional District election, 2020

General election

General election for U.S. House California District 10

Incumbent Josh Harder defeated Ted Howze in the general election for U.S. House California District 10 on November 3, 2020.

		Candidate	%	Votes
✔		Josh Harder (D)	55.2	166,865
		Ted Howze (R)	44.8	135,629

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 302,494
= candidate completed the Ballotpedia Candidate Connection survey.
If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey.
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Nonpartisan primary election

Nonpartisan primary for U.S. House California District 10

The following candidates ran in the primary for U.S. House California District 10 on March 3, 2020.

		Candidate	%	Votes
✔		Josh Harder (D)	44.1	69,668
✔		Ted Howze (R)	33.9	53,574
		Bob Elliott (R)	13.0	20,481
		Mike Barkley (D)	3.5	5,561
		Marla Livengood (R)	3.3	5,270
		Ryan Blevins (D)	2.2	3,536

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 158,090
= candidate completed the Ballotpedia Candidate Connection survey.
If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey.
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Withdrawn or disqualified candidates

• Jeff Denham (R)
• Charles Dossett (R)

2018

See also: California's 10th Congressional District election, 2018

General election

General election for U.S. House California District 10

Josh Harder defeated incumbent Jeff Denham in the general election for U.S. House California District 10 on November 6, 2018.

		Candidate	%	Votes
✔		Josh Harder (D)	52.3	115,945
		Jeff Denham (R)	47.7	105,955

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	Incumbents are bolded and underlined. The results have been certified. Source	Total votes: 221,900
= candidate completed the Ballotpedia Candidate Connection survey.
If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey.
Do you want a spreadsheet of this type of data? Contact our sales team.

Nonpartisan primary election

Nonpartisan primary for U.S. House California District 10

The following candidates ran in the primary for U.S. House California District 10 on June 5, 2018.

		Candidate	%	Votes
✔		Jeff Denham (R)	37.5	45,719
✔		Josh Harder (D)	17.0	20,742
		Ted Howze (R)	14.6	17,723
		Michael Eggman (D)	10.2	12,446
		Virginia Madueno (D)	9.2	11,178
		Sue Zwahlen (D)	8.2	9,945
		Mike Barkley (D)	2.4	2,904
		Dotty Nygard (D)	0.9	1,100

---

	Incumbents are bolded and underlined. The results have been certified.	Total votes: 121,757
= candidate completed the Ballotpedia Candidate Connection survey.
If you are a candidate and would like to tell readers and voters more about why they should vote for you, complete the Ballotpedia Candidate Connection Survey.
Do you want a spreadsheet of this type of data? Contact our sales team.

Withdrawn or disqualified candidates

• Lisa Battista (D)
• Terra Snover (Independent)
• Mateo Morelos Bedolla (D)
• Seth Vaughn (D)
• Scott Shoblom (Independent)

2016

See also: California's 10th Congressional District election, 2016

Heading into the election, Ballotpedia rated this race as a race to watch. Incumbent Jeff Denham (R) defeated Michael Eggman (D) in the general election on November 8, 2016. Denham and Eggman defeated Robert Hodges (R) and Michael Barkley (D) in the top-two primary on June 7, 2016.

U.S. House, California District 10 General Election, 2016

Party		Candidate	Vote %	Votes
	Republican	Jeff Denham Incumbent	51.7%	124,671
	Democratic	Michael Eggman	48.3%	116,470
Total Votes				241,141
Source: California Secretary of State

U.S. House, California District 10 Primary, 2016

Party		Candidate	Vote %	Votes
	Republican	Jeff Denham Incumbent	47.7%	61,290
	Democratic	Michael Eggman	27.6%	35,413
	Democratic	Michael Barkley	14.5%	18,576
	Republican	Robert Hodges	10.2%	13,130
Total Votes				128,409
Source: California Secretary of State

2014

See also: California's 10th Congressional District elections, 2014

The 10th Congressional District of California held an election for the U.S. House of Representatives on November 4, 2014. Incumbent Jeff Denham (R) defeated Michael Eggman (D) in the general election.

U.S. House, California District 10 General Election, 2014

Party		Candidate	Vote %	Votes
	Republican	Jeff Denham Incumbent	56.1%	70,582
	Democratic	Michael Eggman	43.9%	55,123
Total Votes				125,705
Source: California Secretary of State

2012

See also: California's 10th Congressional District elections, 2012

According to a Cook Political Report analysis, the 10th District was one of 13 congressional districts in California that was at least somewhat competitive in 2012. The analysis rated it as Leans Republican. The incumbent from the 19th District, Jeff Denham, won the election in the district.

U.S. House, California District 10 General Election, 2012

Party		Candidate	Vote %	Votes
	Republican	Jeff Denham Incumbent	52.7%	110,265
	Democratic	Jose Hernandez	47.3%	98,934
Total Votes				209,199
Source: California Secretary of State "Official Election Results, 2012 General Election"

2010
On November 2, 2010, John Garamendi won election to the United States House. He defeated Gary Clift (R) and Jeremy Cloward (G) in the general election.

U.S. House, California District 10 General Election, 2010
Party		Candidate	Vote %	Votes
	Democratic	John Garamendi incumbent	58.8%	137,578
	Republican	Gary Clift	37.9%	88,512
	Green	Jeremy Cloward	3.3%	7,716
Total Votes				233,806

2009 special
On November 3, 2009, John Garamendi won election to the United States House. He defeated four candidates in the special general election.

U.S. House, California District 10 Special election, 2009
Party		Candidate	Vote %	Votes
	Democratic	John Garamendi	52.8%	72,817
	Republican	David Harmer	42.8%	59,017
	Green	Jeremy Cloward	1.8%	2,515
	Peace and Freedom	Mary C. McIlroy	1.3%	1,846
	American Independent	Jerome "Jerry" Denham	1.2%	1,591
Total Votes				137,786
Source: Results via California State Board of Elections

2008
On November 4, 2008, Ellen Tauscher won re-election to the United States House. She defeated Nicholas Gerber (R) and Eugene Ruyle (P&F) in the general election.

U.S. House, California District 10 General Election, 2008
Party		Candidate	Vote %	Votes
	Democratic	Ellen Tauscher incumbent	65.1%	192,226
	Republican	Nicholas Gerber	31.1%	91,877
	Peace and Freedom	Eugene Ruyle	3.7%	11,062
Total Votes				295,165

2006
On November 7, 2006, Ellen Tauscher won re-election to the United States House. She defeated Darcy Linn (R) in the general election.

U.S. House, California District 10 General Election, 2006
Party		Candidate	Vote %	Votes
	Democratic	Ellen Tauscher incumbent	66.4%	130,859
	Republican	Darcy Linn	33.5%	66,069
	N/A	Write-in	0%	50
Total Votes				196,978

2004
On November 2, 2004, Ellen Tauscher won re-election to the United States House. She defeated Jeff Ketelson (R) in the general election.

U.S. House, California District 10 General Election, 2004
Party		Candidate	Vote %	Votes
	Democratic	Ellen Tauscher incumbent	65.7%	182,750
	Republican	Jeff Ketelson	34.3%	95,349
Total Votes				278,099

2002
On November 5, 2002, Ellen Tauscher won re-election to the United States House. She defeated Sonia Esther Harden (L) in the general election.

U.S. House, California District 10 General Election, 2002
Party		Candidate	Vote %	Votes
	Democratic	Ellen Tauscher incumbent	75.6%	126,390
	Libertarian	Sonia Esther Harden	24.4%	40,807
Total Votes				167,197

2000
On November 7, 2000, Ellen Tauscher won re-election to the United States House. She defeated Claude Hutchinson, Jr. (R) and Valerie Irene Janlois (Natural Law) in the general election.

U.S. House, California District 10 General Election, 2000
Party		Candidate	Vote %	Votes
	Democratic	Ellen Tauscher incumbent	52.6%	160,429
	Republican	Claude Hutchinson, Jr.	44.2%	134,863
	Natural Law	Valerie Irene Janlois	3.1%	9,527
Total Votes				304,819

1998
On November 3, 1998, Ellen Tauscher won re-election to the United States House. She defeated Charles Ball (R), Valerie Janlois (Natural Law) and John Place (Reform) in the general election.

U.S. House, California District 10 General Election, 1998
Party		Candidate	Vote %	Votes
	Democratic	Ellen Tauscher incumbent	53.5%	127,134
	Republican	Charles Ball	43.4%	103,299
	Natural Law	Valerie Janlois	1.7%	3,941
	Reform	John Place	1.4%	3,435
Total Votes				237,809

1996
On November 5, 1996, Ellen Tauscher won election to the United States House. She defeated Bill Baker (R), John Place (Reform), Valerie Janlois (Natural Law) and Gregory Lyon (L) in the general election.

U.S. House, California District 10 General Election, 1996
Party		Candidate	Vote %	Votes
	Democratic	Ellen Tauscher	48.6%	137,726
	Republican	Bill Baker incumbent	47.2%	133,633
	Reform	John Place	2.2%	6,354
	Natural Law	Valerie Janlois	1.1%	3,047
	Libertarian	Gregory Lyon	0.9%	2,423
Total Votes				283,183

1994
On November 8, 1994, Bill Baker won re-election to the United States House. He defeated Ellen Schwartz (D) and Craig Cooper (P&F) in the general election.

U.S. House, California District 10 General Election, 1994
Party		Candidate	Vote %	Votes
	Republican	Bill Baker incumbent	59.3%	138,916
	Democratic	Ellen Schwartz	38.6%	90,523
	Peace and Freedom	Craig Cooper	2.1%	4,802
Total Votes				234,241

1992
On November 3, 1992, Bill Baker won election to the United States House. He defeated Wendell Williams (D) in the general election.

U.S. House, California District 10 General Election, 1992
Party		Candidate	Vote %	Votes
	Republican	Bill Baker	52%	145,702
	Democratic	Wendell Williams	48%	134,635
	N/A	Write-in	0%	92
Total Votes				280,429

1990
On November 6, 1990, Don Edwards won re-election to the United States House. He defeated Mark Patrosso (R) in the general election.

U.S. House, California District 10 General Election, 1990
Party		Candidate	Vote %	Votes
	Democratic	Don Edwards incumbent	62.7%	81,875
	Republican	Mark Patrosso	37.3%	48,747
	N/A	Write-in	0%	15
Total Votes				130,637

Redistricting

2020-2021

See also: Redistricting in California after the 2020 census

The California Citizens Redistricting Commission voted 14-0 in favor of a new congressional district map on December 20, 2021, and delivered those maps to the secretary of state on December 27, 2021. California was apportioned 52 seats in the U.S. House of Representatives after the 2020 census, a net loss of one seat compared to apportionment after the 2010 census. This map took effect for California's 2022 congressional elections.

How does redistricting in California work? In California, a non-politician commission draws both congressional and state legislative district lines. Established in 2008 by ballot initiative, the commission comprises 14 members: five Democrats, five Republicans, and four belonging to neither party. A panel of state auditors selects the pool of nominees from which the commissioners are appointed. This pool comprises 20 Democrats, 20 Republicans, and 20 belonging to neither party. The majority and minority leaders of both chambers of the state legislature may each remove two members from each of the aforementioned groups. The first eight commission members are selected at random from the remaining nominees. These first eight comprise three Democrats, three Republicans, and two belonging to neither party. The first eight commissioners appoint the remaining six, which must include two Democrats, two Republicans, and two belonging to neither party.

Commissioners must meet the following requirements in order to serve:

1. Members must have voted in at least two of the last three statewide elections.
2. Members cannot have switched party affiliation for at least five years.
3. "Neither commissioners nor immediate family may have been, within 10 years of appointment, a candidate for federal or state office or member of a party central committee; an officer, employee, or paid consultant to a federal or state candidate or party; a registered lobbyist or paid legislative staff; or a donor of more than $2,000 to an elected candidate."
4. Members cannot be "staff, consultants or contractors for state or federal government" while serving as commissioners. The same prohibition applies to the family of commission members.

In order to approve a redistricting plan, nine of the commission's 14 members must vote for it. These nine must include three Democrats, three Republicans, and three belonging to neither party. Maps drawn by the commission may be overturned by public referendum. In the event that a map is overturned by the public, the California Supreme Court must appoint a group to draw a new map.

The California Constitution requires that districts be contiguous. Further, the state constitution mandates that "to the extent possible, [districts] must ... preserve the geographic integrity of cities, counties, neighborhoods and communities of interest." Districts must also "encourage compactness." State Senate and Assembly districts should be nested within each other where possible.

California District 10
until January 2, 2023

Click a district to compare boundaries.

California District 10
starting January 3, 2023

Click a district to compare boundaries.

2010-2011

This is the 10th Congressional District of California after the 2001 redistricting process.

See also: Redistricting in California after the 2010 census

In 2011, the California State Legislature re-drew the congressional districts based on updated population information from the 2010 census.

District analysis

See also: The Cook Political Report's Partisan Voter Index

See also: FiveThirtyEight's elasticity scores

2026

Heading into the 2026 elections, based on results from the 2024 and 2020 presidential elections, the Cook Partisan Voter Index for this district is D+18. This meant that in those two presidential elections, this district's results were 18 percentage points more Democratic than the national average. This made California's 10th the 71st most Democratic district nationally.

2024

Heading into the 2024 elections, based on results from the 2020 and 2016 presidential elections, the Cook Partisan Voter Index for this district was D+18. This meant that in those two presidential elections, this district's results were 18 percentage points more Democratic than the national average. This made California's 10th the 78th most Democratic district nationally.

Daily Kos calculated what the results of the 2020 presidential election in this district would have been following redistricting. Joe Biden (D) would have defeated Donald Trump (R) 68.6%-29.3%.

2022

Heading into the 2022 elections, based on results from the 2020 and 2016 presidential elections, the Cook Partisan Voter Index for this district was D+18. This meant that in those two presidential elections, this district's results were 18 percentage points more Democratic than the national average. This made California's 10th the 77th most Democratic district nationally.

Daily Kos calculated what the results of the 2020 presidential election in this district would have been following redistricting. Joe Biden (D) would have received 68.6% of the vote in this district and Donald Trump (R) would have received 29.3%.

2018

Heading into the 2018 elections, based on results from the 2016 and 2012 presidential elections, the Cook Partisan Voter Index for this district was EVEN. This meant that in those two presidential elections, this district's results were within 1 percentage point of the national average. This made California's 10th Congressional District the 198th most Democratic nationally.

FiveThirtyEight's September 2018 elasticity score for states and congressional districts measured "how sensitive it is to changes in the national political environment." This district's elasticity score was 1.08. This means that for every 1 point the national political mood moved toward a party, the district was expected to move 1.08 points toward that party.

See also

• Redistricting in California
• California's 10th Congressional District election, 2024
• California's 10th Congressional District election, 2022
• California's 10th Congressional District election, 2020
• California's 10th Congressional District election, 2018

External links

• GovTrack District 10

Footnotes

[show]

California's current delegation to the United States Congress

Senators

Alex Padilla (D)

Adam Schiff (D)

Representatives

District 1

Doug LaMalfa (R)

District 2

Jared Huffman (D)

District 3

Kevin Kiley (R)

District 4

Mike Thompson (D)

District 5

Tom McClintock (R)

District 6

Ami Bera (D)

District 7

Doris Matsui (D)

District 8

John Garamendi (D)

District 9

Josh Harder (D)

District 10

Mark DeSaulnier (D)

District 11

Nancy Pelosi (D)

District 12

Lateefah Simon (D)

District 13

Adam Gray (D)

District 14

Eric Swalwell (D)

District 15

Kevin Mullin (D)

District 16

Sam Liccardo (D)

District 17

Ro Khanna (D)

District 18

Zoe Lofgren (D)

District 19

Jimmy Panetta (D)

District 20

Vince Fong (R)

District 21

Jim Costa (D)

District 22

David Valadao (R)

District 23

Jay Obernolte (R)

District 24

Salud Carbajal (D)

District 25

Raul Ruiz (D)

District 26

Julia Brownley (D)

District 27

George Whitesides (D)

District 28

Judy Chu (D)

District 29

Luz Rivas (D)

District 30

Laura Friedman (D)

District 31

Gil Cisneros (D)

District 32

Brad Sherman (D)

District 33

Pete Aguilar (D)

District 34

Jimmy Gomez (D)

District 35

Norma Torres (D)

District 36

Ted Lieu (D)

District 37

Sydney Kamlager-Dove (D)

District 38

Linda Sánchez (D)

District 39

Mark Takano (D)

District 40

Young Kim (R)

District 41

Ken Calvert (R)

District 42

Robert Garcia (D)

District 43

Maxine Waters (D)

District 44

Nanette Barragán (D)

District 45

Derek Tran (D)

District 46

Lou Correa (D)

District 47

Dave Min (D)

District 48

Darrell Issa (R)

District 49

Mike Levin (D)

District 50

Scott Peters (D)

District 51

Sara Jacobs (D)

District 52

Juan Vargas (D)

Democratic Party (45)

Republican Party (9)