Raymond Jon Tester is an American politician and farmer serving as the senior United States senator from Montana, a seat he has held since 2007. A member of the Democratic Party, Tester is the dean of Montana's congressional delegation and the only Democrat who holds 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. He is generally considered a centrist or moderate Democrat.