Senate District 15
Current member
Mark Spreitzer Democratic
On the November 2026 ballot — challenged by Christopher Dean (S), Scott Fleming (R)
Decided by 22.8 points in 2022.
Who has held this seat
From the Legislature's service records; our records begin with the 2009 session. District boundaries were redrawn in 2011, 2022, and again in 2024, so the seat's constituency shifts across those lines.
General-election results
Official Wisconsin Elections Commission canvass results.
November 2022 75,260 ballots cast
- Mark Spreitzer D 46,192 61.4%
- Mark Trofimchuck R 29,006 38.5%