Mark Sanford's latest adminssion in the saga renders moot all other theories about why he spent the last week in Argentina without telling anyone: He was having an affair.

"I've been unfaithful to my wife and I've developed a relationship with what stared as a dear, dear friend from Argentina," he finally said. The affair has been going on for a year, he later explained.

Sanford announced that he is resigning as head of the Republican Governors Association.

"I spent the past five days of my life crying in Argentina," he said, "so I could come back and cry here."

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