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&mdash;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.

Close races
Seats where the margin of victory was under 10%:


 * 1) State Senate district 31, 0.66%
 * 2) State Senate district 25, 2.58%
 * 3) State Senate district 5, 4.46% (gain)
 * 4) State Senate district 29, 4.64% (gain)
 * 5) State Senate district 21, 5.09% (gain)
 * 6) State Senate district 23, 8.47% (gain)

Retiring

 * 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.