2010 Wisconsin Senate election

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

Close races

Seats where the margin of victory was under 10%:

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Outgoing incumbents

Retired

Alan Lasee,, representing District 1 since 1977, announced he would not seek re-election.
Judy Robson, representing District 15 since 1998, announced she would not seek re-election.
Theodore Kanavas, representing District 33 since 2001, announced he would not seek re-election.