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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 PaulRand PaulTrump, GOP fumble chance to govern GOP senators pitch alternatives after House pulls ObamaCare repeal bill Rand Paul takes victory lap on GOP health bill MORE (R-Ky.), Sen. Lindsey GrahamLindsey GrahamGraham: 'I'm glad' Ivanka will be working in the White House Trump tweets promotion for Fox News show GOP senators pitch alternatives after House pulls ObamaCare repeal bill MORE (R-S.C.), and Sen. Tim ScottTim ScottA better economic policy Republicans rebuke King for racial remarks Conway on criticism: 'I'm not there to read about myself' 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.