Tester successfully ran for a third term against Republican Montana State Auditor Matt Rosendale, eventually winning a high-turnout election by over 15,000 votes and crossing the 50 percent threshold in vote totals for the first time in three Senate elections. President Donald Trump made a particular effort to unseat Tester, traveling to Montana four times over the preceding months; despite some increase in Republican turnout in the state, Tester secured victory with increased turnout in Democratic-leaning areas of the state, strong support from Native Americans and women, increased support among independent voters, and 67 percent of the youth vote.