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

 
U.S. Republican presidential candidate Paul speaks as Santorum, Romney and Gingrich listen during the Republican presidential candidates debate in Mesa
U.S. Republican presidential candidate U.S. Rep. Ron Paul (R-TX) (L) speaks as former U.S. Senator Rick Santorum (2nd from L), former Massachusetts Governor Mitt Romney and former Speaker of the House Newt Gingrich (R) look on during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott (UNITED STATES - Tags: POLITICS ELECTIONS)