Chris McDaniel is taking the "GOP Civil War" to a new level. Two months ago, the tea party-backed Mississippi Senate candidate addressed a neo-Confederate conference and costume ball hosted by a group that promotes the work of present-day secessionists and contends the wrong side won the "war of southern independence." Other speakers at the event included [Al Benson], who believes Lincoln was a Marxist, and Ryan Walters, a PhD candidate who worked on McDaniel's first political campaign and wrote recently that the "controversy" over President Barack Obama's birth certificate "hasn't really been solved."

McDaniel, a state senator, is challenging incumbent Republican Sen. Thad Cochran in next summer's GOP Senate primary. After announcing his run last week, McDaniel quickly picked up endorsements from the Club for Growth and the Senate Conservatives Fund, a political action committee founded by former Sen. Jim DeMint (R-S.C.), a prominent backer of the tea party. Both groups are key players in the internal GOP battle between establishment-minded Republicans and tea party insurgents and are backing right-wing challenges to incumbent Republicans whom they deem insufficiently conservative. Cochran, who is finishing out his 35th year in the Senate and has not said if he will seek re-election, earned the ire of tea partiers by voting to re-open the federal government and avert defaulting on the debt. McDaniel, whose campaign bus features an image of Article I of the Constitution, has promised to make Cochran's debt ceiling vote a centerpiece of his campaign....