2012 Wisconsin Senate election

The 2012 Wisconsin Senate elections were held on Tuesday, November 6, 2012. Sixteen of the 33 seats in the Wisconsin Senate were up for election&mdash;the even-numbered districts. This was the first Senate general election to take place after redistricting following the 2010 United States census. Before the election, 17 Senate seats were held by Democrats and 16 seats were held by Republicans. 10 Democratic seats and 6 Republican seats were up in this election. The primary election took place on August 13, 2012.

Republicans flipped two Democratic-held Senate seat and won the chamber majority, entering the 101st Wisconsin Legislature with 18 of 33 State Senate seats.

Close races
Seats where the margin of victory was under 10%:
 * 1) State Senate district 18, 0.7% (gain)
 * 2) State Senate district 30, 8.55%

Retiring

 * Jim Holperin (D–Conover), representing district 12 since 2008, announced that he would not run for re-election.

Seeking other office

 * Spencer Coggs (D–Milwaukee), representing district 6 since 2003, was elected Milwaukee Treasurer at the April 2012 election, and then did not seek re-election to the Senate in the fall.