CalledUnofficial results
Wisconsin Senate District 15
Wisconsin State Senate · Wisconsin
Mark Spreitzer won re-election by 19.4 points over Scott Fleming.
Staggered Senate
Mark SpreitzerDemocrat · winner · incumbent
57.4%41,249
Scott FlemingRepublican
38.0%27,304
Christopher DeanIndependent
4.7%3,368
20% of the expected vote counted · 71,921 votes
Source: civicAPI unofficial results and race callsUpdated Nov 5, 2026, 2:54 PM ET
Where the race moved
Against the 2024 presidential vote
The seat's recent races
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)
Money in this race
Each line compares the two campaigns on one scale.
Mark SpreitzerScott Fleming
$208K
Raised by the campaign
$27.2K
$137.6K
Spent by the campaign
$9.3K
$13.7K
Cash on hand
$4.5K
Other candidates' campaigns: Christopher Dean $3.2K.
Campaign money: Wisconsin Ethics Commission, through Oct 28, 2026; Wisconsin Ethics Commission, through Oct 17, 2026.
Source: Wisconsin Ethics Commission campaign filingsUpdated Oct 1, 2026
Pre-election forecast (final, Nov 3)
Our model's last run before Election Day, Nov 3, 2026. It no longer updates.
- Mark Spreitzer
- 99%
- Scott Fleming
- 1%
- Projected margin
- D+19.4
The candidates
Mark Spreitzer (D)
Incumbent, Wisconsin State Senate, first elected 2022Scott Fleming (R)
Incumbent, Wisconsin State Senate, first elected 2022Scott Fleming (R)
Also on the ballot: Christopher Dean (Independent), 4.7%