WASHINGTON — Republican Tim Sheehy won the U.S. Senate seat in Montana on Wednesday, defeating three-term incumbent Jon Tester and flipping a closely watched Senate seat. Tester was the only Democrat holding statewide office in Montana, which has voted for the Republican candidate in every presidential contest since 1992. Sheehy, a former U.S. Navy SEAL, ran as a Trump-supporting conservative in a state where the former president is immensely popular. The Associated Press declared Sheehy the winner at 6:26 a.m. EST.