This July 29, 2002 file photo shows US President George W. Bush (R) shaking hands with Mark Sanford (L) at the North Charleston Convention Center 29 July 2002 in Charleston, South Carolina. Govonor Mark Sanford admitted June 24, 2009, amid speculation over his whereabouts for the last several days, that he has been engaged in an extramarital affair with an Argentinian woman. "I've been unfaithful to my wife," Sanford told a news conference in Columbia, the state capital."I developed a relationship with what started as a dear, dear friend from Argentina." His voice choking at times, Sanford apologized to his wife and four sons, his staff and supporters, and said he would resign immediately as head of the Republican Governors Association. The affair was discovered five months ago, Sanford said.