In this picture taken June, 26, 2008 South Carolina Gov. Mark Sanford, center, accompanied by unidentified persons, arrives to the government house during his visit to La Plata, Argentina. Sanford admitted that he'd secretly flown to Argentina to visit a woman with whom he'd been having an affair. during a news conference in Columbia, S.C. , Wednesday, June 24, 2009. Sanford will resign as head of the Republican Governors Association.