FILE - In this Aug. 11, 2011, file photo, then-Republican presidential candidate and former Massachusetts Gov. Mitt Romney holds a pork chop on a stick as he campaigns at the Iowa State Fair in Des Moines, Iowa. For those who would be president, a visit to the Iowa State Fair may be the purest distillation of the campaign experience in the state that starts the voting in the race for the White House. The 10-day event starts Aug. 13, 2015, and most of the 2016 hopefuls will pass through. (AP Photo/Charles Dharapak, File)