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Sanford famously revealed he had secretly left the country in 2009 to engage in an extramarital affair with an Argentine woman. 

Still, he's garnered some high-profile conservative endorsements as election day approaches. In addition to the Tea Party Express, FreedomWorks — another prominent Tea Party organization — announced its support. Sanford has also been endorsed by Sen. Rand PaulRandal (Rand) Howard PaulDem wins Kentucky state House seat in district Trump won by 49 points GOP's tax reform bait-and-switch will widen inequality Pentagon budget euphoria could be short-lived MORE (R-Ky.), Sen. Lindsey GrahamLindsey Olin GrahamCongress punts fight over Dreamers to March Pence tours Rio Grande between US and Mexico GOP looks for Plan B after failure of immigration measures MORE (R-S.C.), and Sen. Tim ScottTimothy (Tim) Eugene ScottAfter Florida school shooting, vows for change but no clear path forward GOP senator: FBI failure in Florida shooting 'a separate issue' from Russia probe Sunday shows preview: Russian charges, Florida shooting dominate coverage MORE (R-S.C.), whose appointment to the Senate to replace Jim DeMint opened the congressional seat for a special election.

A poll released Friday from the website RedRacingHorses.com showed Sanford and Colbert Busch in a dead heat, with both candidates receiving 46 percent of the vote.

--This report was originally published at 1:44 p.m. and last updated at 2:09 p.m.