DES MOINES, IA - MARCH 07: U.S. Senator Lindsey Graham (R-SC) fields questions from Bruce Rastetter at the Iowa Ag Summit on March 7, 2015 in Des Moines, Iowa. The event allows the invited speakers, many of whom are potential 2016 Republican presidential hopefuls, to outline their views on agricultural issue. (Photo by Scott Olson/Getty Images)
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