Republican presidential candidate, Sen. Marco Rubio, R-Fla., raises his arm with Gov. Nikki Haley and Sen. Tim Scott, R-S.C., during a town hall Thursday in Greenville, S.C. Paul Sancya/AP hide caption

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Sen. Jim DeMint's endorsement has become the gold standard for true blue conservatives seeking a Senate seat. Alex Wong/Getty Images hide caption

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Black GOP Lawmakers Face Tricky Relations With Democrats

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