S.D. Senator Tim Johnson announces Tuesday, March 26, 2013 his retirement from the U.S. Senate after his term ends in early 2015 at the Al Neuharth Media Center in Vermillion, S.D. (AP Photo/Argus Leader, Jay Pickthorn)

Associated Press
S.D. Senator Tim Johnson announces Tuesday, March 26, 2013 his retirement from the U.S. Senate after his term ends in early 2015 at the Al Neuharth Media Center in Vermillion, S.D. (AP Photo/Argus Leader, Jay Pickthorn)
S.D. Senator Tim Johnson announces Tuesday, March 26, 2013 his retirement from the U.S. Senate after his term ends in early 2015 at the Al Neuharth Media Center in Vermillion, S.D. (AP Photo/Argus Leader, Jay Pickthorn)
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