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Senate District 15

Represented by Mark Spreitzer, a Democrat, since January 2023. It holds three Assembly districts: Assembly District 43, Assembly District 44 and Assembly District 45.

Mark Spreitzer

State senator. Democrat.

On the ballot

Mark Spreitzer is on the November 2026 ballot, running against Scott Fleming, a Republican, and Christopher Dean, an Independent. See the race

In 2022, the race was decided by 22.8 points.

Their full record

Who has held this seat

From the Legislature's service records, which begin with the 2009 session. District lines were redrawn in 2011, 2022 and 2024, so the area this seat covers has changed over time.

  1. Mark Spreitzer Democrat

    Jan 2023 to now

  2. Janis Ringhand Democrat

    Jan 2015 to Jan 2023

  3. Timothy Cullen Democrat

    Jan 2011 to Dec 2014

  4. Judy Robson Democrat

    Jan 2009 to Dec 2010

Election results

Official general-election counts from the Wisconsin Elections Commission. Shares are of all votes cast, including write-ins. Results before 2024 are labeled with the maps they were held under, when this district number covered different ground.

November 2022 2022 maps

Mark Spreitzer, a DEM, won with 61.4% of 75,260 votes cast.

Mark Spreitzer, DEM: 46,192 61.4% Mark Trofimchuck, REP: 29,006 38.5%

Boundaries from the Legislative Technology Services Bureau's 2024 maps. Results from the Wisconsin Elections Commission. Checked Sep 15, 2026.