Republican presidential candidates (L-R) former U.S. Senator Rick Santorum (R-PA), former Massachusetts Governor Mitt Romney, former House Speaker Newt Gingrich and U.S. Rep. Ron Paul (R-TX), applaud on stage before participating in a Republican presidential candidates debate in Charleston, South Carolina, January 19, 2012. REUTERS/Eric Thayer (UNITED STATES – Tags: POLITICS ELECTIONS)