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U.S. Senate election results map. Blue denotes counties/districts won by Baldwin. Red denotes those won by Thompson. | |||||||||||||||||||||||||||
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The 2012 United States Senate election in Wisconsin took place on November 6, 2012, alongside a U.S. presidential election as well as other elections to the United States Senate and House of Representatives and various state and local elections. Incumbent Democratic Senator Herb Kohl retired instead of running for re-election to a fifth term.
Primary elections were held on August 14, 2012. Democratic Congresswoman Tammy Baldwin of Wisconsin's 2nd congressional district ran unopposed for her party's nomination. The Republican nominee was former Governor of Wisconsin and former Secretary of Health and Human Services Tommy Thompson, who won with a plurality in a four-way race. In the general election, Baldwin defeated Thompson and won the open seat. She became the first woman elected to represent Wisconsin in the Senate and the first openly gay U.S. Senator in history. This is also the first time Thompson lost a statewide race.