Republican presidential candidates (from left) Rick Santorum, George Pataki, Rand Paul, Mike Huckabee, Marco Rubio, Ted Cruz, Ben Carson, Donald Trump, Jeb Bush, Scott Walker, Carly Fiorina, John Kasich and Chris Christie take the stage during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday in Simi Valley, Calif. (Associated Press) ** FILE **