FILE - In this Oct. 14, 2009 file photo, Democratic Sen. Tim Johnson is seen on Capitol Hill in Washington. Former Republican South Dakota Gov. Mike Rounds said Thursday, Nov. 29, 2012

 

              FILE - In this Oct. 14, 2009 file photo, Democratic Sen. Tim Johnson is seen on Capitol Hill in Washington.  Former Republican South Dakota Gov. Mike Rounds said Thursday, Nov. 29, 2012
FILE - In this Oct. 14, 2009 file photo, Democratic Sen. Tim Johnson is seen on Capitol Hill in Washington. Former Republican South Dakota Gov. Mike Rounds said Thursday, Nov. 29, 2012, that he will run for the U.S. Senate now held by Johnson in 2014. (AP Photo/Haraz N. Ghanbari, File)