Fans of GOP presidential candidate Ron Paul show their support outside the Mesa Arts Center before Wednesday night's Republican debate in Mesa, Ariz. Ethan Miller/Getty Images hide caption

itoggle caption Ethan Miller/Getty Images

The Republican presidential candidates took the stage for a Jan. 23 debate at the University of South Florida in Tampa. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images