NEW YORK, NY - NOVEMBER 03: Republican presidential candidate Donald Trump speaks at a news conference before a public signing for his new book "Crippled America: How to Make America Great Again," at the Trump Tower Atrium on November 3, 2015 in New York City. According to a new poll, Ben Carson, the retired neurosurgeon, has pulled ahead of Trump with 29% of Republican primary voters. (Photo by Spencer Platt/Getty Images)
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