Disgraced former S.C. Gov. Mark Sanford won the GOP primary last night, securing the party's nomination in the state's 1st Congressional District. Still, Republicans fear that the tarnished ex-executive -- whose 2009 affair left him unpopular with both GOP officials and female voters -- could flub the May 7 election and hand a once-safe seat to the Democrats. A complicating factor: Sanford's opponent, Elizabeth Colbert Busch, can count on her brother, celebrity faux newsman Stephen Colbert, to provide star power and fundraising support.

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