The 2018 Wisconsin Senate elections were held on Tuesday, November 6, 2018, at the Fall general election in Wisconsin. Seventeen of the 33 seats in the Wisconsin Senate were up for election—the odd-numbered districts. Before the election, Republicans held 18 seats and Democrats held 15 seats. Of the seats up for election, 10 were held by Republicans and seven were held by Democrats. The primary election was held on August 14, 2018.

Republicans maintained control of the Senate, flipping one Democratic-held seat to enter the 104th Wisconsin Legislature with 19 of 33 Senate seats.

Results summary Statewide results of the 2018 Wisconsin State Senate election:

Seats Party (majority caucus shading) TotalDemocraticRepublican Last election (2016) 7 9 16 Total after last election (2016) 13 20 33 Total before this election 15 18 33 Up for election 7 10 17 of which: Incumbent retiring 1 0 1 Vacated 0 0 0 Unopposed 1 1 2 This election 6 11 17 Change from last election 1 1 Total after this election 14 19 33 Change in total 1 1

Party Candi-dates Votes Seats % +/– % Republican Party 15 675,016 52.31% 11 1 64.71% Democratic Party 15 605,142 46.90% 6 1 35.29% Independent 1 1,776 0.14% 0 0.00% Write-in 2 57 0.00% 0 0.00% Scattering 8,346 0.65% 0 0.00%Total 33 1,290,337 100.00% 17 100.00%

Close races Seats where the margin of victory was under 10%:

(gain)

Special elections Two special elections were held during 2018 for vacancies in the state Senate. Democrats won both special elections, for a net gain of two seats.

Dist.Previous incumbentThis electionSenatorPartyFirstelectedCandidate(s)Result01 Frank LaseeRep. 2010 Incumbent resigned on .New member elected .Democratic gain.10 Sheila HarsdorfRep. 2000 Incumbent resigned on .New member elected .Democratic gain.

Outgoing incumbents Retiring Terry Moulton (R–Chippewa Falls), representing District 23 since 2010, did not run for re-election.

Seeking other office Kathleen Vinehout (D–Alma), representing District 31 since 2006, ran for governor of Wisconsin, but lost in the primary. Leah Vukmir (R–Brookfield), representing District 5 since 2010, ran for United States Senate, but lost the general election.

Predictions SourceRankingAs of Governing | October 8, 2018

Candidates and results Results of the 2018 Wisconsin State Senate election by district:

DistrictDemocraticRepublicanOthersTotalResult Votes % Votes % Votes % Votes District 1 39,414 45.42% 47,289 54.50% 65 0.07% 86,768 Republican gainDistrict 3 36,875 97.40% - - 985 2.60% 37,860 Democratic holdDistrict 5 45,591 48.75% 47,836 51.15% 102 0.11% 93,529 Republican holdDistrict 7 56,198 66.25% 28,459 33.55% 165 0.19% 84,822 Democratic holdDistrict 9 31,684 41.47% 44,680 58.47% 45 0.06% 76,409 Republican holdDistrict 11 - - 59,512 95.89% 2,554 4.11% 62,066 Republican holdDistrict 13 34,385 40.90% 49,668 59.07% 24 0.03% 84,077 Republican holdDistrict 15 54,381 96.53% - - 1,952 3.47% 56,333 Democratic holdDistrict 17 31,757 45.86% 37,465 54.10% 26 0.04% 69,248 Republican holdDistrict 19 38,179 46.73% 43,493 53.23% 29 0.04% 81,701 Republican holdDistrict 21 35,111 41.91% 48,603 58.01% 69 0.08% 83,783 Republican holdDistrict 23 29,637 40.82% 42,958 59.17% 11 0.02% 72,606 Republican holdDistrict 25 39,624 51.06% 37,960 48.92% 20 0.03% 77,604 Democratic holdDistrict 27 64,606 66.16% 32,993 33.79% 54 0.06% 97,653 Democratic holdDistrict 29 27,627 35.73% 49,657 64.22% 41 0.05% 77,325 Republican holdDistrict 31 40,073 51.67% 35,684 46.01% 1,804 2.33% 77,561 Democratic holdDistrict 33 - - 68,759 96.85% 2,233 3.15% 70,992 Republican holdTotal 605,142 46.90% 675,016 52.31% 10,179 0.79% 1,290,337

See also 2018 Wisconsin elections 2018 Wisconsin gubernatorial election 2018 Wisconsin Attorney General election 2018 Wisconsin State Assembly election 2018 United States Senate election in Wisconsin 2018 United States House of Representatives elections in Wisconsin 2018 United States elections Wisconsin Senate Elections in Wisconsin Redistricting in Wisconsin

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