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Wisconsin State Senate elections, 2018

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GeneralNovember 6, 2018
PrimaryAugust 14, 2018
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Republicans maintained their majority as a result of the 2018 elections for the Wisconsin State Senate, controlling 19 seats to Democrats' 14. Seventeen of 33 Senate seats were up for election. At the time of the election, Republicans held 18 seats to Democrats' 15.

Ballotpedia identified six of the races as battlegrounds, including three Democratic-held districts and three Republican-held districts. Republicans won four of those elections, including one in a Democratic-held district, and Democrats won the remaining two.

Wisconsin changed from a Republican trifecta to divided government as a result of the 2018 elections. Republicans held majorities in the state House and Senate, but lost the gubernatorial race. The state had been under a Republican trifecta since 2010 when Republicans took control of the governor's office, the state Senate, and the state House. This broke the a Democratic trifecta that formed in 2009.

Majorities in the state Senate changed five times between 1992 and 2016. During that time, no party maintained control for more than six years. The state Senate changed hands in four of the six midterm elections during the Obama, Bush, and Clinton presidencies.

Because state senators in Wisconsin serve four-year terms, winning candidates in this election served through 2022 and played a role in Wisconsin's redistricting process. The state legislature draws both state legislative and congressional district boundaries in Wisconsin.

The Wisconsin State Senate was one of 87 state legislative chambers with elections in 2018. There are 99 chambers throughout the country. In 2017, three chambers in Virginia and New Jersey were up for election. In 2016, 86 out of 99 legislative chambers held elections. Prior to 2018, the Wisconsin State Senate last held elections in 2016.

Wisconsin state senators serve staggered, four-year terms and half of the state Senate is up for election every two years. In 2018, odd-numbered districts in the state Senate were up for election. Prior to that, the 2014 elections were the last time odd-numbered districts were up for election in the state Senate. Two districts had 2014 elections that were decided by fewer than five points.

Democratic Party For more information about the Democratic primary, click here.
Republican Party For more information about the Republican primary, click here.




Post-election analysis

See also: State legislative elections, 2018

The Republican Party maintained control of both chambers of the Wisconsin State Legislature in the 2018 election. The Wisconsin State Senate was identified as a battleground chamber. Seventeen out of 33 seats were up for election. Republicans increased their majority in the Wisconsin State Senate from 18-15 to 19-14. One Democratic incumbent was defeated in the general election.

The Wisconsin State Assembly held elections for all 99 seats. The Republican majority in the State Assembly was reduced from 64-35 to 63-36. Two Democratic incumbents were defeated in the primary and no incumbents were defeated in the general election.

National background

On November 6, 2018, 87 of the nation's 99 state legislative chambers held regularly scheduled elections for 6,073 of 7,383 total seats, meaning that nearly 82 percent of all state legislative seats were up for election.

  • Entering the 2018 election, Democrats held 42.6 percent, Republicans held 56.8 percent, and independents and other parties held 0.6 percent of the seats up for regular election.
  • Following the 2018 election, Democrats held 47.3 percent, Republicans held 52.3 percent, and independents and other parties held 0.4 percent of the seats up for regular election.
  • A total of 469 incumbents were defeated over the course of the election cycle, with roughly one-third of them defeated in the primary.

Want more information?

Districts

See also: Wisconsin state legislative districts

Use the interactive map below to find your district.

Candidates

See also: Statistics on state legislative candidates, 2018

General election candidates

Wisconsin State Senate General Election 2018

  • Incumbents are marked with an (i) after their name.
  • Candidate Connection = candidate completed the Ballotpedia Candidate Connection survey.
Office Democratic Party Democratic Republican Party Republican Other
District 1

Caleb Frostman (i)

Green check mark transparent.pngAndré Jacque

District 3

Green check mark transparent.pngTim Carpenter (i)

District 5

Julie Henszey

Green check mark transparent.pngDale Kooyenga

District 7

Green check mark transparent.pngChris Larson (i)

Red Arnold  Candidate Connection

District 9

Kyle Whelton

Green check mark transparent.pngDevin LeMahieu (i)

District 11

Green check mark transparent.pngStephen Nass (i)

District 13

Michelle Zahn

Green check mark transparent.pngScott Fitzgerald (i)

District 15

Green check mark transparent.pngJanis Ringhand (i)

District 17

Kriss Marion  Candidate Connection

Green check mark transparent.pngHoward Marklein (i)

District 19

Lee Snodgrass

Green check mark transparent.pngRoger Roth (i)

District 21

Lori Hawkins  Candidate Connection

Green check mark transparent.pngVan Wanggaard (i)

District 23

Chris Kapsner

Green check mark transparent.pngKathy Bernier

District 25

Green check mark transparent.pngJanet Bewley (i)

James Bolen

District 27

Green check mark transparent.pngJon Erpenbach (i)

Casey Helbach

District 29

Richard Pulcher

Green check mark transparent.pngJerry Petrowski (i)

District 31

Green check mark transparent.pngJeff Smith

Mel Pittman

Aaron Camacho (Green Party)

District 33

Green check mark transparent.pngChris Kapenga (i)

Write-in candidates

Primary candidates

Wisconsin State Senate Primary 2018

  • Incumbents are marked with an (i) after their name.
  • Candidate Connection = candidate completed the Ballotpedia Candidate Connection survey.
Office Democratic Party Democratic Republican Party Republican Other
District 1

Green check mark transparent.pngCaleb Frostman (i)

Green check mark transparent.pngAndré Jacque
Bill Nauta

District 3

Green check mark transparent.pngTim Carpenter (i)

District 5

Green check mark transparent.pngJulie Henszey

Green check mark transparent.pngDale Kooyenga

District 7

Green check mark transparent.pngChris Larson (i)

Green check mark transparent.pngRed Arnold  Candidate Connection

District 9

Green check mark transparent.pngKyle Whelton

Green check mark transparent.pngDevin LeMahieu (i)

District 11

Green check mark transparent.pngStephen Nass (i)

District 13

Green check mark transparent.pngMichelle Zahn

Green check mark transparent.pngScott Fitzgerald (i)

District 15

Green check mark transparent.pngJanis Ringhand (i)

District 17

Green check mark transparent.pngKriss Marion  Candidate Connection

Green check mark transparent.pngHoward Marklein (i)

District 19

Dan Grady
Green check mark transparent.pngLee Snodgrass

Green check mark transparent.pngRoger Roth (i)

District 21

Green check mark transparent.pngLori Hawkins  Candidate Connection

Green check mark transparent.pngVan Wanggaard (i)

District 23

Green check mark transparent.pngChris Kapsner

Green check mark transparent.pngKathy Bernier

District 25

Green check mark transparent.pngJanet Bewley (i)

Green check mark transparent.pngJames Bolen

District 27

Green check mark transparent.pngJon Erpenbach (i)

Green check mark transparent.pngCasey Helbach

District 29

Green check mark transparent.pngRichard Pulcher

Green check mark transparent.pngJerry Petrowski (i)

District 31

Steve Boe
Jon Schultz
Green check mark transparent.pngJeff Smith

Green check mark transparent.pngMel Pittman

Green Party

Green check mark transparent.pngAaron Camacho
District 33

Green check mark transparent.pngChris Kapenga (i)

Margins of victory

See also: Margin of victory analysis for the 2018 state legislative elections

A margin of victory (MOV) analysis for the 2018 Wisconsin State Senate races is presented in this section. MOV represents the percentage of total votes that separated the winner and the second-place finisher. For example, if the winner of a race received 47 percent of the vote and the second-place finisher received 45 percent of the vote, the MOV is 2 percent.

The table below presents the following figures for each party:

  • Elections won
  • Elections won by less than 10 percentage points
  • Elections won without opposition
  • Average margin of victory[1]
Wisconsin State Senate: 2018 Margin of Victory Analysis
Party Elections won Elections won by less than 10% Unopposed elections Average margin of victory[1]
Democratic Party Democratic
6
2
2
18.2%
Republican Party Republican
11
4
2
13.8%
Grey.png Other
0
0
0
N/A
Total
17
6
4
16.0%



The margin of victory in each race is presented below. The list is sorted from the closest MOV to the largest (including unopposed races).

Wisconsin State Senate: 2018 Margin of Victory by District
District Winning Party Losing Party Margin of Victory
Wisconsin State Senate District 25
Electiondot.png Democratic
Ends.png Republican
2.1%
Wisconsin State Senate District 5
Ends.png Republican
Electiondot.png Democratic
2.4%
Wisconsin State Senate District 31
Electiondot.png Democratic
Ends.png Republican
5.7%
Wisconsin State Senate District 19
Ends.png Republican
Electiondot.png Democratic
6.5%
Wisconsin State Senate District 17
Ends.png Republican
Electiondot.png Democratic
8.2%
Wisconsin State Senate District 1
Ends.png Republican
Electiondot.png Democratic
9.1%
Wisconsin State Senate District 21
Ends.png Republican
Electiondot.png Democratic
16.1%
Wisconsin State Senate District 9
Ends.png Republican
Electiondot.png Democratic
17.0%
Wisconsin State Senate District 13
Ends.png Republican
Electiondot.png Democratic
18.2%
Wisconsin State Senate District 23
Ends.png Republican
Electiondot.png Democratic
18.3%
Wisconsin State Senate District 29
Ends.png Republican
Electiondot.png Democratic
28.5%
Wisconsin State Senate District 27
Electiondot.png Democratic
Ends.png Republican
32.4%
Wisconsin State Senate District 7
Electiondot.png Democratic
Ends.png Republican
32.8%
Wisconsin State Senate District 11
Ends.png Republican
None
Unopposed
Wisconsin State Senate District 15
Electiondot.png Democratic
None
Unopposed
Wisconsin State Senate District 3
Electiondot.png Democratic
None
Unopposed
Wisconsin State Senate District 33
Ends.png Republican
None
Unopposed


Seats flipped

See also: State legislative seats that changed party control, 2018

The below map displays each seat in the Wisconsin State Senate which changed partisan hands as a result of the 2018 elections, shaded according to the partisan affiliation of the winner in 2018. Hover over a shaded district for more information.

State legislative seats flipped in 2018, Wisconsin State Senate
District Incumbent 2018 winner Direction of flip
Wisconsin State Senate District 1 Democratic Party Caleb Frostman Republican Party André Jacque D to R

Incumbents retiring

Three incumbents did not run for re-election in 2018. Those incumbents were:

Name Party Office
Leah Vukmir Ends.png Republican Senate District 5
Terry Moulton Ends.png Republican Senate District 23
Kathleen Vinehout Electiondot.png Democratic Senate District 31

2018 battleground chamber

See also: State legislative battleground chambers, 2018

Ballotpedia identified the Wisconsin State Senate as one of 22 battleground chambers in 2018. These were chambers that we anticipated to be, overall, more competitive than other chambers and had the potential to see significant shifts in party control.

The chamber was selected because it met the following conditions:

  • Competitive seats: In 2014, two Democratic seats had a margin of victory that was less than 10 percent. District 1, which Democrats flipped in a June 2018 special election, also had a margin of victory of less than 10 percent. Two Republicans seats had margins of victory that were just over 10 percent. See the 2018 races to watch here.
  • Majority holds 55 percent of the seats or less: Republicans held 18 of 33 seats, which was 54.5 percent.
  • Majority seats up: Ten Republican seats and seven Democratic seats were up in 2018.
  • Outside ratings: Governing listed this chamber as "Leans Republican."[2]
  • Recent party control switches: This chamber flipped party control twice between 2006 and 2016. It flipped from Republican to Democratic control in 2006 and back to Republican control in 2010

Party control: 2006 - 2016
Election Year: 2006 2008 2010 2012 2014 2016
Winning Party: D D R R R R

Battleground races

Wisconsin State Senate
Battleground races
Democratic seats
Democratic Party District 1
Democratic Party District 25
Democratic Party District 31
Republican seats
Republican Party District 5
Republican Party District 17
Republican Party District 19

Ballotpedia identified six battleground races in the Wisconsin State Senate 2018 elections: three Democratic seats and three Republican seats. Based on analysis of these districts' electoral histories, these races had the potential to be more competitive than other races and could possibly have led to shifts in a chamber's partisan balance.

To determine state legislative battleground races in 2018, Ballotpedia looked for races that fit one or more of the four factors listed below:

  1. If the incumbent won less than 55 percent of the vote in the most recent election prior to 2018
  2. If the presidential candidate opposite of the incumbent's party won the district in the 2016 elections and the incumbent’s margin of victory in the previous election was 10 percentage points or less
  3. If the presidential candidate opposite of the incumbent's party won the district in the 2016 elections and the incumbent did not file to run for re-election
  4. If the presidential candidate opposite of the incumbent's party won the district in the 2016 elections by 20 points or more

Other factors could also cause a race to be classified as a battleground. For example, Ballotpedia may have considered an election to be a battleground race if an outside group or a national or state party announced that they were targeting a specific seat in order to flip it. We may have also determined a race to be a battleground if it received an unusual amount of media attention. Two additional factors were open seats and districts impacted by redistricting.


Democratic PartyDistrict 1

Who won this race?

Republican André Jacque defeated incumbent Democrat Caleb Frostman.

What party controlled the seat heading into the election?

The Democratic Party

Who were the candidates running?

Democratic Party Caleb Frostman (incumbent)
Republican Party André Jacque

What made this a battleground race?

This was a district that changed partisan control in a June 2018 special election. Incumbent Caleb Frostman (D) was first elected in a June 2018 special election where he received 51.4 percent of the vote and defeated his Democratic opponent by 2.8 points. In 2014, Republican Frank Lasee won the seat by about 20 points. District 1 was one of 23 Wisconsin Senate districts that Republican Donald Trump won in the 2016 presidential election. Trump carried District 1 by 17.7 points. Mitt Romney (R) won the district in the 2012 presidential election by 4.4 points.

Republican PartyDistrict 5

Who won this race?

Republican Dale Kooyenga defeated Democrat Julie Henszey.

What party controlled the seat heading into the election?

The Republican Party

Who were the candidates running?

Democratic Party Julie Henszey
Republican Party Dale Kooyenga

What made this a battleground race?

This was a district that had a close margin of victory in the 2016 presidential election and the incumbent did not file for re-election. Incumbent Leah Vukmir (R) was first elected in 2010 and was unopposed in her 2014 re-election bid. She did not file for re-election in 2018 in order to run for U.S. Senate. District 5 was one of 23 Wisconsin Senate districts that Republican Donald Trump won in the 2016 presidential election. Trump carried District 5 by 1.0 points. Mitt Romney (R) won the district in the 2012 presidential election by 13.2 points.

Republican PartyDistrict 17

Who won this race?

Republican incumbent Howard Marklein defeated Democrat Kriss Marion.

What party controlled the seat heading into the election?

The Republican Party

Who were the candidates running?

Democratic Party Kriss Marion
Republican Party Howard Marklein (incumbent)

What made this a battleground race?

This was a district where the incumbent had a margin of victory of just over 10 points in 2014 and Barack Obama (D) won in 2012. Incumbent Howard Marklein (R) was first elected in 2014 with around 55 percent of the vote. District 17 was one of 23 Wisconsin Senate districts that Republican Donald Trump won in the 2016 presidential election. Trump carried District 17 by 8.5 points. Barack Obama (D) won the district in the 2012 presidential election by 14.3 points.

Republican PartyDistrict 19

Who won this race?

Republican incumbent Roger Roth defeated Democrat Lee Snodgrass.

What party controlled the seat heading into the election?

The Republican Party

Who were the candidates running?

Democratic Party Lee Snodgrass
Republican Party Roger Roth (incumbent)

What made this a battleground race?

This was a district where the incumbent had a margin of victory of just over 10 points in 2014 and Barack Obama (D) won in 2012. Incumbent Roger Roth (R) was first elected in 2014 with around 57 percent of the vote. District 19 was one of 23 Wisconsin Senate districts that Republican Donald Trump won in the 2016 presidential election. Trump carried District 19 by 7.1 points. Barack Obama (D) won the district in the 2012 presidential election by 0.1 points.

Democratic PartyDistrict 25

Who won this race?

Democratic incumbent Janet Bewley defeated Republican James Bolen.

What party controlled the seat heading into the election?

The Democratic Party

Who were the candidates running?

Democratic Party Janet Bewley (incumbent)
Republican Party James Bolen

What made this a battleground race?

This was a district where the incumbent won less than 55 percent of the vote in 2014 and the presidential candidate of the opposite party won. Incumbent Janet Bewley (D) was first elected in 2014 with around 51.2 percent of the vote. District 25 was one of 23 Wisconsin Senate districts that Republican Donald Trump won in the 2016 presidential election. Trump carried District 25 by 9.5 points. Barack Obama (D) won the district in the 2012 presidential election by 12.5 points.

Democratic PartyDistrict 31

Who won this race?

Democrat Jeff Smith defeated Republican Mel Pittman.

What party controlled the seat heading into the election?

The Democratic Party

Who were the candidates running?

Democratic Party Jeff Smith
Republican Party Mel Pittman Green Party Aaron Camacho

What made this a battleground race?

This was a district where the incumbent won less than 55 percent of the vote in 2014 and the presidential candidate of the opposite party won. Incumbent Kathleen Vinehout (D) was first elected in 2006 and was re-elected in 2014 with around 52.4 percent of the vote. She did not file for re-election in 2018. District 31 was one of 23 Wisconsin Senate districts that Republican Donald Trump won in the 2016 presidential election. Trump carried District 31 by 3.8 points. Barack Obama (D) won the district in the 2012 presidential election by 10.2 points.

Battleground races map

Wisconsin political history

See also: Partisan composition of state senates and State government trifectas

Party control

2018

In the 2018 elections, Republicans increased their majority in the Wisconsin State Senate from 18-15 to 19-14.

Wisconsin State Senate
Party As of November 6, 2018 After November 7, 2018
     Democratic Party 15 14
     Republican Party 18 19
Total 33 33

2016

In the 2016 elections, Republicans increased their majority in the Wisconsin State Senate from 18-14 with one vacancy to 20-13.

Wisconsin State Senate
Party As of November 7, 2016 After November 8, 2016
     Democratic Party 14 13
     Republican Party 18 20
     Vacancy 1 0
Total 33 33

Trifectas

A state government trifecta is a term that describes single-party government, when one political party holds the governor's office and has majorities in both chambers of the legislature in a state government. Republicans in Wisconsin gained a state government trifecta as a result of the 2010 elections, when the governorship and both legislative chambers switched to Republican control. Republicans also had trifectas in the state in 1995 and 1998. Democrats held a trifecta following the 2008 elections.

Wisconsin Party Control: 1992-2025
Two years of Democratic trifectas  •  Ten years of Republican trifectas
Scroll left and right on the table below to view more years.

Year 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Governor R R R R R R R R R R R D D D D D D D D R R R R R R R R D D D D D D D
Senate D R R R D D R D D D D R R R R D D D D R R R R R R R R R R R R R R R
House D D D R R R R R R R R R R R R R R D D R R R R R R R R R R R R R R R

Wave election analysis

See also: Wave elections (1918-2016)

The term wave election is frequently used to describe an election cycle in which one party makes significant electoral gains. How many seats would Republicans have had to lose for the 2018 midterm election to be considered a wave election?

Ballotpedia examined the results of the 50 election cycles that occurred between 1918 and 2016—spanning from President Woodrow Wilson's (D) second midterm in 1918 to Donald Trump's (R) first presidential election in 2016. We define wave elections as the 20 percent of elections in that period resulting in the greatest seat swings against the president's party.

Applying this definition to state legislative elections, we found that Republicans needed to lose 494 seats for 2018 to qualify as a wave election.

The chart below shows the number of seats the president's party lost in the 10 state legislative waves from 1918 to 2016. Click here to read the full report.

State legislative wave elections
Year President Party Election type State legislative seats change Elections analyzed[3]
1932 Hoover R Presidential -1,022 7,365
1922 Harding R First midterm -907 6,907
1966 Johnson D First midterm[4] -782 7,561
1938 Roosevelt D Second midterm -769 7,179
1958 Eisenhower R Second midterm -702 7,627
2010 Obama D First midterm -702 7,306
1974 Ford R Second midterm[5] -695 7,481
1920 Wilson D Presidential -654 6,835
1930 Hoover R Presidential -640 7,361
1954 Eisenhower R First midterm -494 7,513

Candidate and office information

Process to become a candidate

See also: Ballot access requirements for political candidates in Wisconsin

DocumentIcon.jpg See statutes: Wisconsin Statutes and Annotations, Chapter 8

The filing process for both ballot-qualified party candidates and other candidates (e.g., independents, non-recognized party candidates, etc.) is the same. The filing procedure, however, does vary somewhat according to the type of office being sought. Please note that only ballot-qualified party candidates can participate in primaries.[6]

For federal and state candidates

A candidate for federal office must file a declaration of candidacy with the Wisconsin Elections Commission. The declaration of candidacy must state the following:[6][7]

  • that the individual is a candidate for the office named on the form
  • that the individual meets the qualifications for office, or will meet the qualifications by the time he or she assumes office if elected
  • that the individual will otherwise qualify for office if nominated and elected

The declaration of candidacy must be sworn before an individual authorized to administer oaths. The declaration of candidacy must be filed by 5:00 p.m. on June 1 preceding the election (if June 1 falls on non-business day, the form will be due on the next preceding business day).[6][7][8][9]

In addition to the declaration of candidacy, the candidate must submit nomination papers to the Wisconsin Elections Commission. The number of signatures required varies according to the office being sought. Requirements are summarized in the table below.[6][8][9]

Nomination paper signature requirements for federal candidates
Office Minimum signatures Maximum signatures
U.S. Senator 2,000 4,000
U.S. Representative 1,000 2,000
State senator 400 800
State representative 200 400
State supreme court justice 2,000 4,000

Nomination papers must be submitted by 5:00 p.m. on June 1 preceding the election (if June 1 falls on non-business day, the form will be due on the next preceding business day).[6][8][9]

Write-in candidates

On April 2, 2014, Governor Scott Walker signed into law AB 419, which requires that write-in candidates file campaign finance statements in order to have their votes tallied. Otherwise, there are no specific filing requirements for write-in candidates.[10]

Salaries and per diem

See also: Comparison of state legislative salaries
State legislative salaries, 2024[11]
SalaryPer diem
$57,408/year$140/day for senators. Dane County senators are allowed half that amount. $155.70/day (with overnight) or $77.85/day (no overnight) for representatives. Dane County representatives receive only $77.85/day.

When sworn in

See also: When state legislators assume office after a general election

Wisconsin legislators assume office the first Monday in January following the election, unless the first Monday of January falls on January 1 or 2. In those cases, legislators assume office on January 3.[12]

Competitiveness

Every year, Ballotpedia uses official candidate lists from each state to examine the competitiveness of every state legislative race in the country. Nationally, there has been a steady decline in electoral competitiveness since 2010. Most notable is that the number of districts with general election competition has dropped by more than 10 percent.

Results from 2016

Click here to read the full study »


Historical context

See also: Competitiveness in State Legislative Elections: 1972-2014

Uncontested elections: In 2014, 32.8 percent of Americans lived in states with an uncontested state senate election. Similarly, 40.4 percent of Americans lived in states with uncontested house elections. Primary elections were uncontested even more frequently, with 61 percent of people living in states with no contested primaries. Uncontested elections often occur in locations that are so politically one-sided that the result of an election would be a foregone conclusion regardless of whether it was contested or not.

F5 Pop. % with uncontested state legislative races.png

Open seats: In most cases, an incumbent will run for re-election, which decreases the number of open seats available. In 2014, 83 percent of the 6,057 seats up for election saw the incumbent running for re-election. The states that impose term limits on their legislatures typically see a higher percentage of open seats in a given year because a portion of incumbents in each election are forced to leave office. Overall, the number of open seats decreased from 2012 to 2014, dropping from 21.2 percent in 2012 to 17.0 percent in 2014.

Incumbent win rates: Ballotpedia's competitiveness analysis of elections between 1972 and 2014 documented the high propensity for incumbents to win re-election in state legislative elections. In fact, since 1972, the win rate for incumbents had not dropped below 90 percent—with the exception of 1974, when 88 percent of incumbents were re-elected to their seats. Perhaps most importantly, the win rate for incumbents generally increased over time. In 2014, 96.5 percent of incumbents were able to retain their seats. Common convention holds that incumbents are able to leverage their office to maintain their seat. However, the high incumbent win rate may actually be a result of incumbents being more likely to hold seats in districts that are considered safe for their party.

Marginal primaries: Often, competitiveness is measured by examining the rate of elections that have been won by amounts that are considered marginal (5 percent or less). During the 2014 election, 90.1 percent of primary and general election races were won by margins higher than 5 percent. Interestingly, it is usually the case that only one of the two races—primary or general—will be competitive at a time. This means that if a district's general election is competitive, typically one or more of the district's primaries were won by more than 5 percent. The reverse is also true: If a district sees a competitive primary, it is unlikely that the general election for that district will be won by less than 5 percent. Primaries often see very low voter turnout in comparison to general elections. In 2014, there were only 27 million voters for state legislative primaries, but approximately 107 million voters for the state legislative general elections.

Redistricting in Wisconsin

See also: Redistricting in Wisconsin

Because state senators in Wisconsin serve four-year terms, winning candidates in this election served through 2022 and played a role in Wisconsin's redistricting process. In Wisconsin, congressional and state legislative district boundaries are drawn by the state legislature. Republicans controlled the redistricting process following the 2010 Census.

State legislature districts in the 2010-2012 redistricting process

On July 20, 2011, the state legislature approved a state legislative redistricting plan, which was signed into law on August 9, 2011. That summer, opponents of the new legislative and congressional maps filed suit in federal court through Baldus v. Brennan, alleging "partisan and racial gerrymandering and ... violation of the Voting Rights Act and various state constitutional criteria." Fifteen Wisconsin residents filed as the plaintiffs in that suit.[13] On March 22, 2012, the United States District Court for the Eastern District of Wisconsin ruled that two state Assembly districts violated the Voting Rights Act. The court ordered that these two districts be redrawn. On April 11, 2012, the court accepted the redrawn districts.[14]

On November 21, 2016, the United States District Court for the Western District of Wisconsin struck down the district map for the Wisconsin State Assembly, finding that the map constituted an illegal partisan gerrymander. The case was brought by a group of 12 state Democrats who alleged that Wisconsin's redistricting plan treated voters "unequally, diluting their voting power based on their political beliefs, in violation of the Fourteenth Amendment's guarantee of equal protection." At the time of redistricting, Republicans controlled both chambers of the state legislature and the governorship. The court ruled 2-1 on the matter, with Judges Kenneth Ripple and Barbara Crabb forming the majority. Ripple wrote the following in the court's majority opinion.[15]

We find that Act 43 [the redistricting plan enacted by the state legislature in 2011] was intended to burden the representational rights of Democratic voters throughout the decennial period by impeding their ability to translate their votes into legislative seats. Moreover, as demonstrated by the results of the 2012 and 2014 elections, among other evidence, we conclude that Act 43 has had its intended effect.[16]
—Judge Kenneth Ripple

Judge William Griesbach dissented and wrote the following in his dissent:[15]

I am unable to accept proof of intent to act for political purposes as a significant part of any test for whether a task constitutionally entrusted to the political branches of government is unconstitutional. If political motivation is improper, then the task of redistricting should be constitutionally assigned to some other body, a change in law we lack any authority to effect.[16]
—Judge William Griesbach

The court declined to order a remedy when it issued its ruling. Instead, the court ordered the parties involved in the case to submit briefs outlining recommended remedies within 30 days.[15]

The plaintiffs in the case proposed a three-part test for determining whether illegal partisan gerrymandering has occurred in a state.[15]

  1. Intent: "Plaintiffs would have to establish that a state had an intent to gerrymander for partisan advantage."
  2. Effect: "Plaintiffs would need to prove a partisan effect by proving that the efficiency gap for a plan exceeds a certain numerical threshold."
  3. State interest: "Plaintiffs placed the burden on the defendants to rebut the presumption by showing that the plan 'is the necessary result of a legitimate state policy, or inevitable given the state's underlying political geography.'"

Peter Barca (D), the minority leader of the Wisconsin State Assembly, said, "This is an historic victory for voters and further admonishment of the extremely slanted maps that trample the democratic will of the people of Wisconsin." Assembly Speaker Robin Vos (R) said, "There are only two things that are certain about this case: it's unprecedented and it isn't over. The state of Wisconsin has competitive legislative districts that meet every traditional principle of redistricting. Republicans win elections because we have better candidates and a better message that continues to resonate with the voters."[17]

On January 27, 2017, the court ordered state lawmakers to draft a remedial redistricting plan for use in the November 2018 election. The court ordered that this plan be adopted by the legislature and signed into law by the governor by November 1, 2017. On March 24, 2017, state attorneys petitioned the Supreme Court of the United States to reverse the district court's ruling.[18][19][20]

On June 19, 2017, the Supreme Court of the United States announced that it would hear the case, Gill v. Whitford. The court also voted 5-4 to stay the district court decision that ordered Wisconsin lawmakers to draft new maps by November 1, 2017. Chief Justice John Roberts and Associate Justices Clarence Thomas, Anthony Kennedy, Samuel Alito, and Neil Gorsuch voted to stay the district court order. Associate Justices Ruth Bader Ginsburg, Elena Kagan, Sonia Sotomayor, and Stephen Breyer dissented.[21][22]

Pivot Counties

See also: Pivot Counties by state

Twenty-three of 72 Wisconsin counties—32 percent—are Pivot Counties. Pivot Counties are counties that voted for Barack Obama (D) in 2008 and 2012 and for Donald Trump (R) in 2016. Altogether, the nation had 206 Pivot Counties, with most being concentrated in upper midwestern and northeastern states.

Counties won by Trump in 2016 and Obama in 2012 and 2008
County Trump margin of victory in 2016 Obama margin of victory in 2012 Obama margin of victory in 2008
Adams County, Wisconsin 21.92% 8.73% 18.35%
Buffalo County, Wisconsin 21.82% 2.93% 14.66%
Columbia County, Wisconsin 2.14% 13.58% 15.26%
Crawford County, Wisconsin 5.40% 19.98% 27.03%
Door County, Wisconsin 3.22% 6.99% 17.33%
Dunn County, Wisconsin 11.09% 4.97% 14.95%
Forest County, Wisconsin 26.58% 5.44% 15.16%
Grant County, Wisconsin 9.43% 13.77% 23.88%
Jackson County, Wisconsin 11.74% 15.01% 21.84%
Juneau County, Wisconsin 26.05% 7.03% 9.00%
Kenosha County, Wisconsin 0.31% 12.23% 18.06%
Lafayette County, Wisconsin 8.99% 15.37% 22.32%
Lincoln County, Wisconsin 20.60% 0.71% 12.48%
Marquette County, Wisconsin 24.09% 0.27% 5.28%
Pepin County, Wisconsin 23.08% 2.22% 12.89%
Price County, Wisconsin 25.00% 0.04% 13.40%
Racine County, Wisconsin 4.28% 3.54% 7.41%
Richland County, Wisconsin 5.50% 16.13% 20.63%
Sauk County, Wisconsin 0.35% 18.47% 23.04%
Sawyer County, Wisconsin 18.41% 0.49% 6.23%
Trempealeau County, Wisconsin 12.64% 14.08% 26.39%
Vernon County, Wisconsin 4.43% 14.73% 22.00%
Winnebago County, Wisconsin 7.34% 3.73% 11.66%

In the 2016 presidential election, Donald Trump (R) won Wisconsin with 47.2 percent of the vote. Hillary Clinton (D) received 46.5 percent. In presidential elections between 1900 and 2016, Wisconsin cast votes for the winning presidential candidate 76.7 percent of the time. In that same time frame, Wisconsin supported Republicans slightly more than Democratic candidates, 50.0 to 46.7 percent. The state, however, favored Democrats in every presidential election from 2000 to 2012 before voting for Trump in 2016.

Presidential results by legislative district

The following table details results of the 2012 and 2016 presidential elections by state Senate districts in Wisconsin. Click [show] to expand the table. The "Obama," "Romney," "Clinton," and "Trump" columns describe the percent of the vote each presidential candidate received in the district. The "2012 Margin" and "2016 Margin" columns describe the margin of victory between the two presidential candidates in those years. The "Party Control" column notes which party held that seat heading into the 2018 general election. Data on the results of the 2012 and 2016 presidential elections broken down by state legislative districts was compiled by Daily Kos.[23][24]

In 2012, Barack Obama (D) won 16 out of 33 state Senate districts in Wisconsin with an average margin of victory of 28.6 points. In 2016, Hillary Clinton (D) won 10 out of 33 state Senate districts in Wisconsin with an average margin of victory of 38.3 points.
In 2012, Mitt Romney (R) won 17 out of 33 state Senate districts in Wisconsin with an average margin of victory of 12 points. In 2016, Donald Trump (R) won 23 out of 33 state Senate districts in Wisconsin with an average margin of victory of 16.5 points. Trump won four districts controlled by Democrats heading into the 2018 elections.

See also

External links

Footnotes

  1. 1.0 1.1 Excludes unopposed elections
  2. Governing, "Democrats Poised to Eat Into GOP's Lead in State Legislatures," May 2, 2018
  3. The number of state legislative seats available for analysis varied, with as many as 7,795 and as few as 6,835.
  4. Lyndon Johnson's (D) first term began in November 1963 after the death of President John F. Kennedy (D), who was first elected in 1960. Before Johnson had his first midterm in 1966, he was re-elected president in 1964.
  5. Gerald Ford's (R) first term began in August 1974 following the resignation of President Richard Nixon (R), who was first elected in 1968 and was re-elected in 1972. Because Ford only served for two full months before facing the electorate, this election is classified as Nixon's second midterm.
  6. 6.0 6.1 6.2 6.3 6.4 Government Accountability Board, "Ballot Access Manual (2023)," accessed apRIL 25, 2025
  7. 7.0 7.1 Wisconsin Statutes and Annotations, "Chapter 8, Section 21," accessed April 28, 2025
  8. 8.0 8.1 8.2 Wisconsin Statutes and Annotations, "Chapter 8, Section 20," accessed April 28, 2025
  9. 9.0 9.1 9.2 Wisconsin Statutes and Annotations, "Chapter 8, Section 15," accessed April 28, 2025
  10. Ballot Access News, "Wisconsin Will No Longer Count Write-in Votes Unless Write-in Candidate Files Paperwork," May 17, 2014
  11. National Conference of State Legislatures, "2024 Legislator Compensation," August 21, 2024
  12. Wisconsin Statutes, "Chapter 13: Legislative Branch: 13.02 Regular sessions," accessed October 5, 2021
  13. Loyola Law School, "UNITED STATES DISTRICT COURT EASTERN DISTRICT OF WISCONSIN," accessed September 12, 2017
  14. All About Redistricting, "Wisconsin," accessed May 7, 2015
  15. 15.0 15.1 15.2 15.3 United States District Court for the Western District of Wisconsin, "Whitford v. Gill: Opinion and Order," November 21, 2016
  16. 16.0 16.1 Note: This text is quoted verbatim from the original source. Any inconsistencies are attributable to the original source.
  17. The Capital Times, "In split decision, federal judges rule Wisconsin's redistricting law an unconstitutional gerrymander," November 21, 2016
  18. United States District Court for the Western District of Wisconsin, "Whitford v. Gill: Opinion and Order," January 27, 2017
  19. Ballot Access News, "Wisconsin Asks U.S. Supreme Court To Hear Partisan Gerrymandering Lawsuit," March 25, 2017
  20. Ballot Access News, "U.S. Supreme Court Will Consider Whether to Grant Stay in Important Wisconsin Gerrymandering Case," May 30, 2017
  21. The Washington Post, "Supreme Court to hear potentially landmark case on partisan gerrymandering," June 19, 2017
  22. Election Law Blog, "UPDATE ON STAY: Breaking: Supreme Court to Hear WI Gerrymandering Case, Gill v. Whitford, Next Term Analysis," June 19, 2017
  23. Daily Kos, "Daily Kos Elections' statewide election results by congressional and legislative districts," July 9, 2013
  24. Daily Kos, "Daily Kos Elections' 2016 presidential results for congressional and legislative districts," February 6, 2017


Current members of the Wisconsin State Senate
Leadership
Senate President:Mary Felzkowski
Majority Leader:Devin LeMahieu
Minority Leader:Dianne Hesselbein
Senators
District 1
District 2
District 3
District 4
District 5
District 6
District 7
District 8
District 9
District 10
District 11
District 12
District 13
District 14
District 15
District 16
District 17
District 18
District 19
District 20
Dan Feyen (R)
District 21
District 22
District 23
District 24
District 25
District 26
District 27
District 28
District 29
District 30
District 31
District 32
District 33
Republican Party (18)
Democratic Party (15)