** FILE ** Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns at the Jefferson County Fairgrounds in Golden, Colo., Thursday, Aug. 2, 2012. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

** FILE ** Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns at the Jefferson County Fairgrounds in Golden, Colo., Thursday, Aug. 2, 2012. (AP Photo/Charles Dharapak)