Report: Rand Paul to endorse Mark Sanford

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Paul's father, former Rep. Ron Paul (R-Texas), endorsed Sanford last week. South Carolina state Sen. Tom Davis (R), a close friend of Sanford's since high school, is also one of the Pauls' close allies — he was Ron Paul's South Carolina presidential campaign chairman in 2012.

Sanford faces a tough race against Democrat Elizabeth Colbert Busch despite the district's Republican lean. He's struggled to overcome his 2009 extramarital affair, and recent trespassing allegations from his ex-wife have also hurt his bid in what appears to be a tight race. The election will take place a week from Tuesday, and the two are set for their first and only debate of the campaign this evening.