Capping days of political mystery surrounding his whereabouts, Gov. Mark Sanford admitted Wednesday he's been having an affair with a woman he visited on a trip to Argentina and said he'll resign as head of the Republican Governors Association.

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President Obama pledged today to halve the $1.3 trillion deficit by the end of his first term and spoke to Governors at a summit, urging them to use the federal stimulus money responsibly in their states. Kwame Holman reports.

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