"South Carolina Governor Mark Sanford, whose mysterious disappearance last Thursday prompted national headlines, acknowledged this afternoon that he had an extramarital affair.
"I've been unfaithful to my wife, and I developed a relationship with what started as a dear, dear friend from Argentina," he said.
Sanford said he would resign as chair of the Republican Governor's Association.
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Sanford's office initially explained Sanford's disappearance from the state by saying the governor was hiking on the Appalachian Trail.
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This morning, however, the Republican governor said he had considered going hiking as a break after the state legislative session, but then changed his mind at the last minute. Upon arriving at the airport, he told The State newspaper that he had been in Buenos Aires."