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Who Is in the First Republican Presidential Debate: Top 10 Primary Candidates

Rand Paul

Rand Paul, the Republican candidate for the Kentucky U.S. Senate seat, speaks to supporters during a campaign stop on November 1, 2010 in Bowling Green, Kentucky. Republican nominee for U.S. Senator Rand Paul is running for the seat against Democratic candidate Jack Conway. (Photo by Tom Pennington/Getty Images)

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Who is in the 2015 first Republican Presidential Debate? Read on for the top 10 primary GOP candidates.