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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Republican governors from around the country met Thursday to discuss broadening the party's base and its plans on education, energy and the environment. Govs. Tim Pawlenty of Minnesota and Mark Sanford of South Carolina offer their views.

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