The 2018 United States Senate election in Wisconsin took place on November 6, 2018, concurrently with a gubernatorial election and U.S. House elections. Incumbent Democratic U.S. Senator Tammy Baldwin won a second term, defeating Republican challenger Leah Vukmir by more than 10 percentage points. The primary elections were held on August 14, with a filing deadline on June 1. Baldwin was unopposed for the Democratic nomination, while Vukmir defeated Charles Barman, Griffin Jones, George Lucia and Kevin Nicholson in the Republican primary.