U.S. Republican presidential candidates Paul, Santorum and Romney listen to Gingrich during the Republican presidential candidates debate in Mesa

 
U.S. Republican presidential candidates Paul, Santorum and Romney listen to Gingrich during the Republican presidential candidates debate in Mesa
U.S. Republican presidential candidates U.S. Rep. Ron Paul (R-TX) (L), former U.S. Senator Rick Santorum and former Massachusetts Governor Mitt Romney (second from R) listen as former Speaker of the House Newt Gingrich (R) speaks during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott (UNITED STATES - Tags: POLITICS ELECTIONS)