Mark Spreitzer
Wisconsin State Senator, District 15 since 2022. Re-elected in 2026. Next on the ballot in 2030.
Wisconsin State Senator, District 15Born 1986
- In office
- 3 yrs
- Since 2022
- Bills became law
- 31
- 548 sponsored, 2025–2026 session
- Votes missed
- 0.0%
- Chamber median 0.0%
- With party
- 99%
- On votes splitting the parties
- Last margin
- +19.4
- Won 2026
- Next election
- 2030
- Nov 5, 2030
Source: Wikidata, congress-legislators and Open States; 99chambers legislative recordsUpdated Oct 27, 2026, 1:51 PM ET
Committees
As of 2026-10.
- Agriculture and Revenue
- Government Operations, Labor and Economic Development
- Transportation and Local Government
Source: Open States committeesUpdated Oct 27, 2026, 9:43 AM ET
Legislation
Acquired immunodeficiency syndrome · Became law Apr 2026
Contractor · Became law Apr 2026
Dentistry · Became law Apr 2026
Identification cards · Became law Apr 2026
Source: Open States billsUpdated Nov 6, 2026, 4:22 PM ET
Voting record
Where Spreitzer sits in the Wisconsin State Senate
Spreitzer is closer to the center than 21% of the chamber's Democrats.
Closest: Tim Carpenter, Melissa Ratcliff, Bob Wirch
Source: 99chambers roll-call scalingUpdated Nov 6, 2026, 5:09 PM ET
With Spreitzer’s party
- Votes with the chamber's Democrats99%
- Cosponsorships of the other party's bills38%
Black tick: the average of Democrats in the Wisconsin State Senate.
Source: 99chambers legislative scores from roll calls and cosponsorships
Key votes
Votes chosen for their effect, not their side: Spreitzer’s vote, each party’s majority, and the result. An orange vote differs from most Democrats.
| Date | Bill | Spreitzer | Dem. majority | Rep. majority | Result |
|---|---|---|---|---|---|
| Mar 17, 2026 | AB 248: Relating to: vacancies in appointive state offices. | No | No | Yes | Passed 17–16 |
| Mar 17, 2026 | AB 595: Relating to: compliance with the federal Help America Vote Act, voter registration data… | No | No | Yes | Passed 18–15 |
| Mar 17, 2026 | AB 461: Relating to: an income tax subtraction for certain overtime compensation. (FE) | No | No | Yes | Passed 21–12 |
| Mar 17, 2026 | AB 1034: Relating to: name, image, and likeness rights for University of Wisconsin System student… | Yes | No | Yes | Passed 17–16 |
| Mar 17, 2026 | AB 601: Relating to: excluding certain event or sports wagers from the definition of “bet”. | Yes | Yes | Yes | Passed 21–12 |
Source: 99chambers key votes from Congress.gov, Voteview and Open States roll calls
Career
Offices held, and every time Spreitzer was on a ballot. Filled marks are general elections won; hollow marks are primaries; an orange outline is a loss.
Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Elections
Margin against the seat’s presidential baseline: how the seat voted for president in the same or nearest year.
| Year | Race | Result | Margin | Seat | +/− |
|---|---|---|---|---|---|
| 2026 | Wisconsin Senate District 15 | Won | D+19.4 | D+7.8 | +11.6 |
| 2022 | Wisconsin State Senate, District 15 | Won | D+22.8 | — | — |
| 2020 | Wisconsin State Assembly, District 45 | Won | D+9.7 | — | — |
| 2018 | Wisconsin State Assembly, District 45 | Won | D+60.5 | — | — |
| 2016 | Wisconsin State Assembly, District 45 | Won | — | — | — |
| 2014 | Wisconsin State Assembly, District 45 | Won | — | — | — |
| 2014 | Wisconsin State Assembly, District 45 (primary) | Won | +8.2 | — | — |
Source: 99chambers results archive; 2026: civicAPI (unofficial)Updated Nov 8, 2026, 7:01 PM ET
Campaign money, 2025–26
- Raised
- $208K
- Spent
- $137.6K
- Cash
- $13.7K
Source: Wisconsin Ethics Commission filings through Oct 28, 2026Updated Nov 1, 2026, 1:46 AM ET
Campaign committees
Open committees can still raise and spend money.
| Friends of Mark Spreitzer State | Active |
Source: Wisconsin Ethics Commission filings through Oct 28, 2026Updated Nov 1, 2026, 1:46 AM ET
Seats Spreitzer has held
- Wisconsin State Senate, District 15 · since 2022
- Wisconsin State Assembly, District 45 · 2014–2022
Source: 99chambers results archive
Who Spreitzer has run against
- Scott Fleming (R) · 2026 general, won
- Mark Trofimchuck (R) · 2022 election, won
- Tawny Gustina (R) · 2020 election, won
- Reese Wood (L) · 2018 election, won
Source: 99chambers results archive; 2026: civicAPI (unofficial)
How we know Spreitzer
One person, matched across every source we use.
- Open States ocd-person/3bd551f3-a086-4f32-9a6e-31d04d0529ce
- Wikidata Q18637919
Source: Identity links: Wikidata, congress-legislators, Open States, FECUpdated Oct 27, 2026, 1:51 PM ET