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URBANDALE, IA - AUGUST 06: U.S. Sen. Rand Paul (R-KY) is questioned by a reporter as he leaves an event at the Iowa GOP Des Moines Victory Office on August 6, 2014 in Urbandale, Iowa. Paul, who is expected to seek the 2016 Republican presidential nomination, was on a three-day eight-city tour of Iowa, the first state to select the presidential nominee. (Photo by Scott Olson/Getty Images)

URBANDALE, IA - AUGUST 06:  U.S. Sen. Rand Paul (R-KY) is questioned by a reporter as he leaves an event at the Iowa GOP Des Moines Victory Office on August 6, 2014 in Urbandale, Iowa.  Paul, who is expected to seek the 2016 Republican presidential nomination, was on a three-day eight-city tour of Iowa, the first state to select the presidential nominee.  (Photo by Scott Olson/Getty Images)