Republican presidential candidate, former Massachusetts Gov. Mitt Romney talks with Iowa Agriculture Secretary Bill Northey, right, and farm owner Lemar Koethe in a corn field in Des Moines, Iowa, Wednesday, Aug. 8, 2012. (AP Photo/Charles Dharapak)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney talks with Iowa Agriculture Secretary Bill Northey, right, and farm owner Lemar Koethe in a corn field in Des Moines, Iowa, Wednesday, Aug. 8, 2012. (AP Photo/Charles Dharapak)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney talks with Iowa Agriculture Secretary Bill Northey, right, and farm owner Lemar Koethe in a corn field in Des Moines, Iowa, Wednesday, Aug. 8, 2012. (AP Photo/Charles Dharapak)
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