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16 of 33 seats in the Wisconsin State Senate 17 seats needed for a majority | ||||||||||||||||||||||||||||||||||||||||
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Results of the elections: | ||||||||||||||||||||||||||||||||||||||||
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The 2020 Wisconsin Senate elections were held on Tuesday, November 3, 2020, at the Fall general electioninWisconsin. 16 of the 33 seats in the Wisconsin Senate were up for election—the even-numbered districts. Before the election, Republicans held 18 seats, Democrats held 13, and two were vacant. Of the seats up for election, seven were held by Republicans, seven were held by Democrats, one was vacated by a Democratic resignation, and one was vacated by a Republican resignation. The primary election was held on August 11, 2020.
Republicans maintained control of the Senate but fell one seat short of a supermajority, defeating one Democratic incumbent and winning an open seat previously held by a Democrat. After the elections, Republicans were set to enter the 105th Wisconsin Legislature with 21 of 33 seats, but one member resigned due to election to another office, leaving them with 20 seats at the start of the legislative term.
| Seats | Party (majority caucus shading) |
Total | ||
|---|---|---|---|---|
| Democratic | Republican | |||
| Last election (2018) | 6 | 11 | 17 | |
| Total after last election (2018) | 14 | 19 | 33 | |
| Total before this election | 13 | 18 | 31 | |
| Up for election | 8 | 8 | 16 | |
| of which: | Incumbent retiring | 3 | 2 | 5 |
| Vacated | 1 | 1 | 2 | |
| Unopposed | 3 | 2 | 5 | |
| This election | 6 | 10 | 16 | |
| Change from last election | 
|
 1 |
1 | |
| Total after this election | 12 | 21 | 33 | |
| Change in total | 2 |
 2 |
| |
Seats where the margin of victory was under 10%:
| District | Incumbent | This race | |||||
|---|---|---|---|---|---|---|---|
| Member | Party | First elected | Status | Primary candidates[8][9] | General election candidates[10] | Result | |
| 2 | Robert Cowles | Republican | 1987 | Running | Robert Cowles (Republican) |  Y Robert Cowles (Rep.)
|
Incumbent re-elected |
| 4 | Lena Taylor | Democratic | 2004 | Running | Lena Taylor (Democratic) | Y Lena Taylor (Dem.)
|
Incumbent re-elected |
| 6 | La Tonya Johnson | Democratic | 2016 | Running |
|
|
Incumbent re-elected |
| 8 | Alberta Darling | Republican | 1992 | Running |
|
|
Incumbent re-elected |
| 10 | Patty Schachtner | Democratic | 2018 (special) | Running |
|
|
Incumbent lost New member elected Republican gain |
| 12 | Tom Tiffany | Republican | 2012 | Vacant |
|
|
Incumbent vacated office to run for U.S. Representative New member elected Republican hold |
| 14 | Luther Olsen | Republican | 2004 | Not running |
|
|
Incumbent retired New member elected Republican hold |
| 16 | Mark F. Miller | Democratic | 2004 | Not running |
|
|
Incumbent retired New member elected Democratic hold |
| 18 | Dan Feyen | Republican | 2016 | Running |
|
|
Incumbent re-elected |
| 20 | Duey Stroebel | Republican | 2014 | Running | Duey Stroebel (Republican) | Y Duey Stroebel (Rep.)
|
Incumbent re-elected |
| 22 | Robert Wirch | Democratic | 1996 | Running | Robert Wirch (Democratic) | Y Robert Wirch (Dem.)
|
Incumbent re-elected |
| 24 | Patrick Testin | Republican | 2016 | Running |
|
|
Incumbent re-elected |
| 26 | Fred Risser | Democratic | 1962 | Not running |
|
Y Kelda Roys (Dem.)
|
Incumbent retired New member elected Democratic hold |
| 28 | Dave Craig | Republican | 2016 | Not running |
|
|
Incumbent retired New member elected Republican hold |
| 30 | Dave Hansen | Democratic | 2000 | Not running |
|
|
Incumbent retired New member elected Republican gain |
| 32 | Jennifer Shilling | Democratic | 2011 (recall) | Vacant |
|
|
Incumbent vacated office New member elected Democratic hold |
| Source | Ranking | As of |
|---|---|---|
| The Cook Political Report[11] | Likely R | October 21, 2020 |
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