LAS VEGAS, NV - JULY 14: Jose Riviera from the Culinary Workers Union Local 226 protests an appearance by U.S. presidential candidate and Wisconsin Gov. Scott Walker at Red Rock Harley-Davidson on July 14, 2015 in Las Vegas, Nevada. Walker launched his campaign on July 13, joining 14 other Republican candidates for the 2016 presidential race. (Photo by Ethan Miller/Getty Images)
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