Republican presidential candidates (L-R) former U.S. Senator Rick Santorum (R-PA), former Massachusetts Governor Mitt Romney, former Speaker of the House Newt Gingrich and U.S Representative Ron Paul (R-TX) arrive on stage before the Republican presidential candidates debate in Tampa, Florida January 23, 2012. REUTERS/Brian Snyder (UNITED STATES - Tags: POLITICS ELECTIONS TPX IMAGES OF THE DAY)