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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 PaulHouse bill set to reignite debate on warrantless surveillance Authorizing military force is necessary, but insufficient GOP feuds with outside group over analysis of tax framework MORE (R-Ky.), Sen. Lindsey GrahamLindsey Olin GrahamDurbin: I had 'nothing to do' with Curbelo snub Republicans jockey for position on immigration Overnight Health Care: House passes 20-week abortion ban | GOP gives ground over ObamaCare fix | Price exit sets off speculation over replacement MORE (R-S.C.), and Sen. Tim ScottTimothy (Tim) Eugene ScottOvernight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open Senators grill ex-Equifax CEO over stock sales Wells Fargo chief defends bank's progress in tense Senate hearing 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.