Two terms will be enough for U.S. Sen. Bob Corker. Corker announced Tuesday he will not seek a third term in the United States Senate.Corker released the following statement that said in part:“After much thought, consideration and family discussion over the past year, Elizabeth and I have decided that I will leave the United States Senate when my term expires at the end of 2018. “When I ran for the Senate in 2006, I told people that I couldn’t imagine serving for more than two terms.