** FILE ** In this April 4, 2012, file photo, Republican presidential candidate, former Pennsylvania Sen. Rick Santorum sits at Bob's Diner in Carnegie, Pa. (AP Photo/Jae C. Hong, File)

Photo by: Jae C. Hong

** FILE ** In this April 4, 2012, file photo, Republican presidential candidate, former Pennsylvania Sen. Rick Santorum sits at Bob's Diner in Carnegie, Pa. (AP Photo/Jae C. Hong, File)