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FILE - In this Sept. 7, 1987, file photo, Dr. Donlin Long, director of neurosurgery, left, and Dr. Ben Carson director of pediatric neurosurgery at Johns Hopkins Hospital in Baltimore, Md.,, holds a brain model of the conjoined twins who separated in a 22-hour surgery, in Baltimore. Carson is the only 2016 candidate for president who has never led a state or company or run for political office, but the retired neurosurgeon maintains that someone who can lead life-or-death operations surely can run the country. (AP Photo/Fred Kraft, File)