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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 PaulDestructive 'fat cat' tax law a complete flop. It's time to repeal it. Trump must take action in Macedonia to fix damage done by Obama and Clinton We can put America first by preventing public health disasters MORE (R-Ky.), Sen. Lindsey GrahamLindsey GrahamTop admiral: North Korea crisis is 'worst I've seen' Comey to testify before Senate Judiciary Committee Overnight Defense: US moving missile defense system to South Korea | Dems want justification for Syria strike | Army pick pushes back against critics of LGBT record MORE (R-S.C.), and Sen. Tim ScottTim ScottWhat prospective college students need to know before they go — or owe Lobbying World Juan Williams: The complicated story of black conservatism 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.