FILE - In this Jan. 31, 2013 file photo, Sen. Ted Cruz, R-Texas speaks during a hearing of the Senate Armed Services Committee on Capitol Hill in Washington. Twice burned, Republicans are treading carefully around tea party groups as they pursue a Senate majority that slipped through their fingers in 2010 and 2012. "You'd have to be an idiot not to prepare" for primary challenges, says one past director of the Republicans' Senate campaign committee. Strongly conservative candidates have captured primaries in the past two election cycles, only to lose winnable races in the fall. (AP Photo/J. Scott Applewhite, File)

Associated Press
FILE - In this Jan. 31, 2013 file photo, Sen. Ted Cruz, R-Texas speaks during a hearing of the Senate Armed Services Committee on Capitol Hill in Washington. Twice burned, Republicans are treading carefully around tea party groups as they pursue a Senate majority that slipped through their fingers in 2010 and 2012. "You'd have to be an idiot not to prepare" for primary challenges, says one past director of the Republicans' Senate campaign committee. Strongly conservative candidates have captured primaries in the past two election cycles, only to lose winnable races in the fall.  (AP Photo/J. Scott Applewhite, File)
FILE - In this Jan. 31, 2013 file photo, Sen. Ted Cruz, R-Texas speaks during a hearing of the Senate Armed Services Committee on Capitol Hill in Washington. Twice burned, Republicans are treading carefully around tea party groups as they pursue a Senate majority that slipped through their fingers in 2010 and 2012. "You'd have to be an idiot not to prepare" for primary challenges, says one past director of the Republicans' Senate campaign committee. Strongly conservative candidates have captured primaries in the past two election cycles, only to lose winnable races in the fall. (AP Photo/J. Scott Applewhite, File)
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