15th Senate District

District

Candidates

Candidates Registered for WI Senate District 15
Data shows every Democratic or Republican candidate registered to run in 2026 plus the incumbent. See footnote for incumbent reelection status.
candidates	registration_date1	Since 1/1/2025 & reported by 2026-02-04
		contributions	disbursements
Democratic
Mark Spreitzer (I)2	2013-11-04	$23,582 in 153 contributions from 94 unique donors. Median: $35	$1,629.93 in 35 transactions
1 The date this candidate's committee first registered (for any office). Click the link for details.
2 registered to run in 2026
Data last updated on 2026-02-05

Past election results

Election Results in Wisconsin State Senate District 15
	votes			Dem. %1	margin (Dem. - Rep.)
	total	Dem.	Rep.		votes	points2
2016 President	83,513	43,173	34,405	55.7%	+8,768	+11.3
2016 Senator	82,552	46,043	33,825	57.6%	+12,218	+15.3
2018 Governor	73,949	42,986	29,068	59.7%	+13,918	+19.3
2018 Senator	73,570	46,125	27,361	62.8%	+18,764	+25.5
2020 President	90,843	49,922	39,262	56.0%	+10,660	+12.0
2022 Governor	70,056	40,719	28,479	58.8%	+12,240	+17.7
2022 Senator	69,756	38,930	30,655	55.9%	+8,275	+11.9
2024 President	94,331	50,042	42,763	53.9%	+7,279	+7.8
2024 Senator	93,347	50,442	40,539	55.4%	+9,903	+10.9
2024 NA	NA	NA	NA	NA	NA	NA
2025 WI Sup. Ct.3	61,864	38,056	23,755	61.6%	+14,301	+23.1
1 Share of the two-party vote. For Rep. share, subtract from 100.
2 Dem % of the two-party vote minus Rep % of the two-party vote
3 Formally nonpartisan candidates assigned party labels based on state endorsements
Election results allocated into 2024 district boundaries based on population overlap. Calculations by John Johnson (johndjohnson.info).

District demographics