Campaign buttons are sold during an event for Democratic presidential candidate Bernie Sanders at the Los Angeles Memorial Sports Arena in Los Angeles, California, U.S., on Monday, Aug. 10, 2015. Some 27,000 people descended Monday night on the Los Angeles Memorial Sports Arena, which has hosted acts such as Madonna and Pink Floyd, to hear from a raspy-voiced 73-year-old who has become the 2016 political season's breakout star. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
