# 2010 Wisconsin Senate election

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vte :
The 2010 Wisconsin Senate elections were held on Tuesday, November 2, 2010. Seventeen of the 33 seats in the Wisconsin State Senate were up for election—the odd-numbered districts. Before the election, 18 Senate seats were held by Democrats and 15 seats were held by Republicans. 10 Democratic seats and 7 Republican seats were up in this election. The primary election took place on September 14, 2010.
Republicans flipped four Democratic-held Senate seats and achieved a majority for the first time since 2004, entering the 100th Wisconsin Legislature with 19 of 33 State Senate seats.

## Summary

| Seats | Seats | Party(majority caucus shading) | Party(majority caucus shading) | Total |
| Seats | Seats | Democratic | Republican | Total |
| Last election (2008) | Last election (2008) | 8 | 8 | 16 |
| Total after last election (2008) | Total after last election (2008) | 18 | 15 | 33 |
| Total before this election | Total before this election | 18 | 15 | 33 |
| Up for election | Up for election | 10 | 7 | 17 |
| of which: | Incumbent retiring | 2 | 2 | 4 |
| of which: | Vacated | | | |
| of which: | Unopposed | | 2 | 2 |
| This election | This election | 6 | 11 | 17 |
| Change from last election | Change from last election | | | |
| Total after this election | Total after this election | 14 | 19 | 33 |
| Change in total | Change in total | 4 | 4 | |

### Close races

Seats where the margin of victory was under 10%:
* State Senate district 31, 0.66%
* State Senate district 25, 2.58%
* State Senate district 5, 4.46% (gain)
* State Senate district 29, 4.64% (gain)
* State Senate district 21, 5.09% (gain)
* State Senate district 23, 8.47% (gain)

## Outgoing incumbents
### Retired

* Alan Lasee, (R–De Pere), representing District 1 since 1977, announced he would not seek re-election.
* Judy Robson (D–Beloit), representing District 15 since 1998, announced she would not seek re-election.
* Theodore Kanavas (R–Brookfield), representing District 33 since 2001, announced he would not seek re-election.

## Predictions

| Source | Ranking | As of |
| Governing| style="color:black;background:#fcc" data-sort-value=1.9|Lean R (flip) | November 1, 2010 |

## Candidates and results

| Dist. | Incumbent | Incumbent | Incumbent | Incumbent | This race | This race | This race |
| Dist. | Member | Party | First elected | Status | Primary | General | Result |
| 01 | Alan Lasee | Republican | 1977 (special) | Not running | | Y Frank Lasee (Rep.) 60.04% Monk Elmer (Dem.) 39.83% | New member elected. Republican hold. |
| 03 | Tim Carpenter | Democratic | 2002 | Running | | Y Tim Carpenter (Dem.) 61.09% Annette Miller Krznarich (Rep.) 38.63% | Incumbent re-elected |
| 05 | Jim Sullivan | Democratic | 2006 | Running | | Y Leah Vukmir (Rep.) 52.15% Jim Sullivan (Dem.) 47.69% | New member elected. Republican gain. |
| 07 | Jeffrey Plale | Democratic | 2003 (special) | Running | Chris Larson (Dem.) 60.7% Jeffrey Plale (Dem.) 39.3% | Y Chris Larson (Dem.) 67.25% Peter Gilbert (Rep.) 32.64% | New member elected. Democratic hold. |
| 09 | Joe Leibham | Republican | 2002 | Running | | Y Joe Leibham (Rep.) 73.11% Jason B. Borden (Dem.) 26.86% | Incumbent re-elected |
| 11 | Neal Kedzie | Republican | 2002 | Running | | Y Neal Kedzie (Rep.) 75.37% L.D. Rockwell (Dem.) 24.55% | Incumbent re-elected |
| 13 | Scott L. Fitzgerald | Republican | 1994 | Running | | Y Scott L. Fitzgerald (Rep.) 67.61% Dwayne Block (Dem.) 29.20% Vittorio Spadaro (Ind.) 3.14% | Incumbent re-elected |
| 15 | Judy Robson | Democratic | 1998 | Not running | | Y Timothy Cullen (Dem.) 58.98% Rick Richard (Rep.) 40.99% | New member elected. Democratic hold. |
| 17 | Dale Schultz | Republican | 1990 | Running | | Y Dale Schultz (Rep.) 62.56% Carol Beals (Dem.) 37.38% | Incumbent re-elected |
| 19 | Michael Ellis | Republican | 1982 | Running | | Y Michael Ellis (Rep.) 99.04% | Incumbent re-elected |
| 21 | John Lehman | Democratic | 2006 | Running | | Y Van H. Wanggaard (Rep.) 52.52% John Lehman (Dem.) 47.43% | New member elected. Republican gain. |
| 23 | Pat Kreitlow | Democratic | 2006 | Running | | Y Terry Moulton (Rep.) 54.20% Pat Kreitlow (Dem.) 45.73% | New member elected. Republican gain. |
| 25 | Bob Jauch | Democratic | 1986 | Running | | Y Robert Jauch (Dem.) 51.27% Dane Deutsch (Rep.) 48.69% | Incumbent re-elected |
| 27 | Jon Erpenbach | Democratic | 1998 | Running | | Y Jon Erpenbach (Dem.) 61.84% Kurt Schlicht (Rep.) 38.13% | Incumbent re-elected |
| 29 | Russ Decker | Democratic | 1990 | Running | | Y Pam Galloway (Rep.) 52.26% Russ Decker (Dem.) 47.62% | New member elected. Republican gain. |
| 31 | Kathleen Vinehout | Democratic | 2006 | Running | | Y Kathleen Vinehout (Dem.) 50.27% Ed Thompson (Rep.) 49.61% | Incumbent re-elected |
| 33 | Theodore Kanavas | Republican | 2001 (special) | Not running | | Y Rich Zipperer (Rep.) 99.50% | New member elected. Republican hold. |