Photos: Rick Santorum's political career Former Sen. Rick Santorum of Pennsylvania speaks at the Point of Grace Church for the Iowa Faith and Freedom Coalition 2015 Spring Kickoff on April 25 in Waukee, Iowa. Hide Caption 1 of 15

Photos: Rick Santorum's political career Santorum speaks at the Point of Grace Church for the Iowa Faith and Freedom Coalition 2015 Spring Kickoff on April 25 in Waukee, Iowa. Hide Caption 2 of 15

Photos: Rick Santorum's political career Santorum speaks at the NRA-ILA Leadership Forum on April 10 at the NRA annual meeting in Nashville, Tennessee. Hide Caption 3 of 15

Photos: Rick Santorum's political career Santorum appears at the NRA-ILA Leadership Forum on April 10 at the NRA annual meeting in Nashville, Tennessee. Hide Caption 4 of 15

Photos: Rick Santorum's political career Santorum fields questions at the Iowa Ag Summit on March 7 in Des Moines, Iowa. Hide Caption 5 of 15

Photos: Rick Santorum's political career Santorum speaks at the Iowa Freedom Summit on January 24 in Des Moines, Iowa. Hide Caption 6 of 15

Photos: Rick Santorum's political career Santorum speaks at the Conservative Political Action Conference in National Harbor, Maryland, on March 15, 2013. Hide Caption 7 of 15

Photos: Rick Santorum's political career Santorum voices his opposition to the U.N. Convention on the Rights of Persons with Disabilities during a news conference with his wife, Karen Santorum, and three of their children on Capitol Hill on November 26, 2012. His daughter Isabella, being held by his wife, was born with a serious genetic disorder. Hide Caption 8 of 15

Photos: Rick Santorum's political career Santorum tries one of the local craft beers while having lunch at Simon's Specialty Cheese following a campaign stop in Appleton, Wisconsin, on April 2, 2012. Hide Caption 9 of 15

Photos: Rick Santorum's political career Santorum bowls at Sabre Lanes in Menasha, Wisconsin, following a campaign rally on April 2, 2012. Hide Caption 10 of 15

Photos: Rick Santorum's political career Santorum makes a grilled cheese sandwich during a campaign stop at Simons Specialty Cheese on April 2, 2012, in Appleton, Wisconsin. Hide Caption 11 of 15

Photos: Rick Santorum's political career Santorum tours a vintage train car with his daughter Sarah during a campaign stop at the National Railroad Museum on April 1, 2012, in Green Bay, Wisconsin. Hide Caption 12 of 15

Photos: Rick Santorum's political career Santorum tours a train engine during a campaign stop at the National Railroad Museum on April 1, 2012, in Green Bay, Wisconsin. Hide Caption 13 of 15

Photos: Rick Santorum's political career Santorum addresses supporters in Lafayette, Louisiana, after winning the Alabama and Mississippi primaries on March 13, 2012. Hide Caption 14 of 15