Former South Carolina Gov. Mark Sanford speaks with a vendor at the Mount Pleasant Farmers Market in Mount Pleasant, S.C., Tuesday, May 7, 2013. He faces Elizabeth Colbert Busch, the sister of political satirist Stephen Colbert, and Green Party candidate Eugene Platt, in Tuesday's balloting. (AP Photo/Rainier Ehrhardt)

Photo by: Rainier Ehrhardt

Former South Carolina Gov. Mark Sanford speaks with a vendor at the Mount Pleasant Farmers Market in Mount Pleasant, S.C., Tuesday, May 7, 2013. He faces Elizabeth Colbert Busch, the sister of political satirist Stephen Colbert, and Green Party candidate Eugene Platt, in Tuesday's balloting. (AP Photo/Rainier Ehrhardt)