Charleston Republican presidential debate
Republican presidential candidates, from left, former U.S. Sen.
The candidates take the stage before the debate. From left: Rick Santorum, Mitt Romney, Newt Gingrich and Ron Paul. (Matt Rourke / Associated Press)
Newt Gingrich gestures during the final Republican presidential debate before South Carolina’s primary. (David Goldman / Associated Press)
Candidate and former Pennsylvania Sen.
Former Massachusetts Gov.
Rep. Ron Paul of Texas has his turn in the debate. (David Goldman / Associated Press)
Mitt Romney makes his point as the other candidates listen, from left: Rick Santorum, Newt Gingrich and Ron Paul. (Emmanuel Dunand / AFP / Getty Images)