FILE - In this Oct. 14, 2009 file photo, Sen. Tim Johnson, D-S.D., is seen on Capitol Hill in Washington. Democratic officials say Johnson intends to announce his retirement on Tuesday, March 26, 2013, a decision that gives Republicans a prime opportunity to pick up a seat in 2014. (AP Photo/Haraz N. Ghanbari, File)

Associated Press
FILE - In this Oct. 14, 2009 file photo, Sen. Tim Johnson, D-S.D., is seen on Capitol Hill in Washington. Democratic officials say Johnson intends to announce his retirement on Tuesday, March 26, 2013, a decision that gives Republicans a prime opportunity to pick up a seat in 2014. (AP Photo/Haraz N. Ghanbari, File)
FILE - In this Oct. 14, 2009 file photo, Sen. Tim Johnson, D-S.D., is seen on Capitol Hill in Washington. Democratic officials say Johnson intends to announce his retirement on Tuesday, March 26, 2013, a decision that gives Republicans a prime opportunity to pick up a seat in 2014. (AP Photo/Haraz N. Ghanbari, File)
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