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
Republican presidential candidate Ron Paul speaks as Rick Santorum, Mitt Romney and Newt Gingrich look on during the Republican presidential candidates debate in Mesa, Arizona, February 22, 2012. REUTERS/Joshua Lott