Wisconsin Senate District 15
State Senate District 15
Covers parts of Rock County, Walworth County and Jefferson County.
Who Holds This Seat
Running in 2026
Democrat · State Senator
- Ballot
- On the 2026 ballot
- Last Change
- Profile updated · Oct 3
- Raised
- Not on file
- Cash on Hand
- Not on file
No finance filing on record.
Independent
- Ballot
- On the 2026 ballot
- Last Change
- Profile updated · Oct 3
- Raised
- Not on file
- Cash on Hand
- Not on file
No finance filing on record.
Republican
- Ballot
- On the 2026 ballot
- Last Change
- Profile updated · Oct 3
- Raised
- Not on file
- Cash on Hand
- Not on file
No finance filing on record.
The District
Includes Janesville, Beloit, Whitewater, Edgerton, Milton, Evansville, Footville, Lake Lorraine, Orfordville, Hanover, Turtle Lake, Fulton and 1 more.
196 precincts · District lines: State senate lines: U.S. Census Bureau (1:500,000 cartographic boundary) · Precinct lines: Wisconsin Legislative Technology Services Bureau, statewide municipal ward collection (July 2026)
Results in This District
| Contest | First | Second | Margin | Votes | Source |
|---|---|---|---|---|---|
| 2024 President108 precinctsWisconsin Elections CommissionOfficial certified results | Kamala D. Harris Tim Walz (D)50,193 · 53.1% | Donald J. Trump JD Vance (R)42,996 · 45.5% | D+7.6 | 94,534 | Wisconsin Elections CommissionOfficial certified results |
| 2024 U.S. Senate108 precinctsWisconsin Elections CommissionOfficial certified results | Tammy Baldwin (D)50,598 · 54.0% | Eric Hovde (R)40,765 · 43.5% | D+10.5 | 93,663 | Wisconsin Elections CommissionOfficial certified results |
| 2022 U.S. Senate113 precinctsWisconsin Elections CommissionOfficial certified results | Mandela Barnes (D)38,930 · 55.9% | Ron Johnson (R)30,655 · 44.1% | D+11.9 | 69,585 | Wisconsin Elections CommissionOfficial certified results |
| 2022 Governor113 precinctsWisconsin Elections CommissionOfficial certified results | Tony Evers Sara Rodriguez (D)40,719 · 58.2% | Tim Michels Roger Roth (R)28,479 · 40.7% | D+17.5 | 70,008 | Wisconsin Elections CommissionOfficial certified results |
| 2020 President92 precinctsWisconsin Elections CommissionOfficial certified results | Joseph R. Biden Kamala D. Harris (D)46,374 · 54.5% | Donald J. Trump Michael R. Pence (R)37,126 · 43.7% | D+10.9 | 85,013 | Wisconsin Elections CommissionOfficial certified results |
Totals add up the certified precinct results for the precincts inside today's district lines. A precinct split by the district line counts in full, or only in the district holding most of its voters where the linkage assigns it to one, and votes a county reported only countywide (some counties' absentee and early votes) are left out, so totals can differ from an official canvass.
Past Results
State Senator District 15
Wisconsin General Election 11/08/2022 · Nov 8, 2022| Candidate | Party | Votes | Share |
|---|---|---|---|
| Mark SpreitzerDemocrat | Democrat | 46,192 | 61.4% |
| Mark TrofimchuckRepublican | Republican | 29,006 | 38.6% |
Official certified results — Wisconsin Elections Commission, certified Nov. 30, 2022 · Wisconsin Elections Commission — official ward-by-ward canvass