Wisconsin State Senate seat · lines in effect since 2024
Wisconsin Senate District 12
A district of about 182,000 people, 23% of adults with a bachelor's degree. It votes R+28.9 relative to the nation for president.
2024 election
Nov 5, 2024- Mary Felzkowski (R) · won67.5%
- Andi Rich (D)32.4%
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 12:13 PM ET
Where it sits among all 33 seats
Every Wisconsin State Senate seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every election for this seat
15 races since 1968. District numbers are redrawn after each census: each group is one set of lines.
| Year | Winner | Runner-up | Won by |
|---|---|---|---|
| Lines first used in 2024 | |||
| 2024 | Mary Felzkowski (R) | Andi Rich (D) | 35.1 |
| Lines first used in 2012 | |||
| 2020 | Mary Felzkowski (R) | Ed Vocke (D) | 31.4 |
| 2016 | Tom Tiffany (R) | Bryan Van Stippen (D) | 25.9 |
| 2012 | Tom Tiffany (R) | Susan Sommer (D) | 15.8 |
| Lines first used in 2002 | |||
| 2008 | James C. Holperin (D) | Tom Tiffany (R) | 2.5 |
| 2004 | Roger M. Breske (D) | Tom Tiffany (R) | 7.0 |
| Lines first used in 1992 | |||
| 2000 | Roger M. Breske (D) | John E. Bailey (I) | 76.9 |
| 1996 | Roger M. Breske (D) | Nancy Levanetz (R) | 14.8 |
| 1992 | Roger M. Breske (D) | Robert G. Ourada (R) | 4.7 |
| Lines first used in 1982 | |||
| 1988 | Lloyd H. Kincaid (D) | Joseph W. Handrick (R) | 8.5 |
| 1984 | Lloyd H. Kincaid (D) | Anderson (R) | 1.9 |
| Lines first used in 1972 | |||
| 1980 | Clifford W. Krueger (R) | — | Unopposed |
| 1976 | Clifford W. Krueger (R) | C. Charles Arndt (D) | 28.8 |
| 1972 | Clifford W. Krueger (R) | Stanley Lato (D) | 23.9 |
| Lines first used in 1962 | |||
| 1968 | Clifford W. Krueger (R) | Vernon Niemuth (D) | 26.6 |
Won by: the winner's lead over the runner-up, in points of the vote. Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Districts that overlap District 12
The state's districts in other chambers that share residents with this one, and the share of District 12's area in each.
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2024 | |
|---|---|
| President | R+29.1 |
| U.S. Senate | R+25.6 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 8, 2026, 7:01 PM ET
Who lives here, compared
Grey bars show the spread of all 33 seats. Small marks are other seats in Wisconsin. The black marker is District 12.
Lower than 91% of seats.
Higher than 97% of seats.
Lower than 97% of seats.
Lowest of 33 seats.
Lower than 97% of seats.
Less dense than 97% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 23WisconsinR+35.9Held RDistrict 13
21% college gradsR+30.8Held RDistrict 2
28% college gradsR+27.4Not up in 2026District 25
27% college gradsR+13.1Held R
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET