An illustration of Former U.S. President Ronald Reagan is displayed on a podium as Jeb Bush, former Governor of Florida and 2016 Republican presidential candidate, speaks during the Scott County Republican party Ronald Reagan Dinner in Davenport, Iowa, U.S., on Tuesday, Oct. 6, 2015. Bush opened a new front in the nomination fight this week by suggesting Marco Rubio, a former Florida colleague 18 years his junior, doesn't have enough experience to hold the Oval Office. Photographer: Daniel Acker/Bloomberg via Getty Images