WASHINGTON (3/26/13)--Sen. Tim Johnson (D-S.D.) is expected to announce later today that he will not seek re-election and will retire when his term ends in 2014. Johnson is the chairman of the Senate Banking Committee, as well as a member of that chamber's Appropriations Committee, Energy and Resources Committee, and Indian Affairs Committee.
Johnson is 66 and has served in the Senate for more than 15 years. Johnson is expected to make his announcement at a press conference he has called for 4 p.m. (ET) at the University of South Dakota, his alma mater.