The political future of South Carolina Gov. Mark Sanford is in question after his admitted infidelity. Sanford says he'll resign as head of the Republican Governors Association after admitting that he had secretly flown to Argentina to visit a woman with whom he was having an affair. But he was silent on whether he would step down as governor. His spokesman says Sanford has "no plans" to do so. Sanford had been rumored as a 2012 presidential candidate. His disappearance for a week sparked controversy over his ability to govern. By leaving the country without formally transferring power, critics say he neglected his gubernatorial authority and put the state at risk. At least one state lawmaker is calling for his resignation. In an emotional news conference Wednesday, Sanford apologized to his wife and four sons, none of whom attended. He also admitted he'd "let down a lot of people."