Ben Carson addresses supporters in Iowa (11 images)

Retired neurosurgeon Dr. Ben Carson, 2016 Republican candidate, surrounded by Secret Service agents, poses for a photo with a supporter at the conclusion of a town hall event at the Northside Cafe, January 5, 2016, in Winterset, Iowa. Carson is running against a large field of GOP candidates, including real estate mogul Donald J. Trump, Texas Sen. Ted Cruz and Florida Sen. Marco Rubio ahead of Iowa's first-in-the-nation caucuses February 1. Photo by Mike Theiler/UPI

Ron Bristle, who farms 2800 acres in Iowa, wears a sticker for retired neurosurgeon Dr. Ben Carson, 2016 Republican candidate, prior to a town hall event at Veterans Auditorium, January 5, 2016, in Panora, Iowa. Photo by Mike Theiler/UPI

Ben Carson makes remarks during a town hall event at Veterans Auditorium, January 5, 2016, in Panora, Iowa. Photo by Mike Theiler/UPI

Supporters of retired neurosurgeon Dr. Ben Carson, 2016 Republican candidate, stand for the National Anthem prior to his remarks, during a town hall event at Veterans Auditorium, January 5, 2016, in Panora, Iowa. Photo by Mike Theiler/UPI