In this Oct. 24, 2015, photo, Republican presidential candidate Dr. Ben Carson greets audience members after speaking at Iowa State University in Ames, Iowa. Seven in 10 Republican and Republican-leaning registered voters say Donald Trump could win the November 2016 election. That compares to 6 in 10 who say the same for retired neurosurgeon Carson, who, like Trump, has tapped into the powerful wave of anti-establishment anger defining the early phases of the 2016 contest. (AP Photo/Charlie Neibergall, File)
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