In this Oct. 24, 2015, photo, Republican presidential candidate Ben Carson greets audience members after speaking outside the Alpha Gamma Rho fraternity at Iowa State University during a campaign stop in Ames, Iowa.
In this Oct. 24, 2015, photo, Republican presidential candidate Ben Carson greets audience members after speaking outside the Alpha Gamma Rho fraternity at Iowa State University during a campaign stop in Ames, Iowa. Charlie Neibergall AP
In this Oct. 24, 2015, photo, Republican presidential candidate Ben Carson greets audience members after speaking outside the Alpha Gamma Rho fraternity at Iowa State University during a campaign stop in Ames, Iowa. Charlie Neibergall AP

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