Raymond Jon Tester is an American politician and farmer serving since 2007 as the senior United States senator from Montana. A member of the Democratic Party, he is the dean of Montana's congressional delegation, and has been the only congressional Democrat since 2015, and since 2021 the only Democrat holding statewide office in Montana. He served in the Montana Senate from 1999 to 2007, and as its president for his last two years in the chamber.