Presidential Candidates Gather At Western Conservative Summit In Denver [Getty Images]

DENVER, CO - JUNE 27: Rick Perry speaks during the Western Conservative Summit at the Colorado Convention Center on June 27, 2015 in Denver, Colorado. The Western Conservative Summit attracts thousands of conservatives and a number of prominent politicians; this year the lineup includes Rick Santorum, Mike Huckabee, Carly Fiorina, Ben Carson, and Scott Walker. (Photo by Theo Stroomer/Getty Images)

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