Former Florida Governor Jeb Bush speaks at the Reagan Library after autographing his new book 'Immigration Wars: Forging an American Solution' on March 8 in Simi Valley, Calif. Getty/AP hide caption

itoggle caption Getty/AP

New Jersey Gov. Chris Christie gives details on his 2014 state budget in Trenton, N.J., Tuesday, Feb. 26, 2013. Rich Schultz/AP hide caption

itoggle caption Rich Schultz/AP

Moderates triumphed at the '76 convention but their candidate, Ronald Reagan, lost the general election in the fall, Anthony Camerano/AP hide caption

itoggle caption Anthony Camerano/AP

Koch served as mayor for three terms (1978-89). Ken Rudin collection hide caption

itoggle caption Ken Rudin collection