07/12/2010 09:41 pm ET | Updated May 25, 2011

Stuart Rothenberg: Is Jim DeMint Obama's Ace In The Hole?

South Carolina Sen. Jim DeMint, who once proclaimed that he'd rather have "30 Republicans in the Senate who believe in principles of freedom than 60 who don't believe in anything," continues to endorse Senate candidates and give leaders in his own party migraine headaches.

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