WASHINGTON, DC - JUNE 09: A supporter holds up a "DUMP DNC" sign during a rally of Democratic presidential candidate Sen. Bernie Sanders (I-VT) near the Robert F. Kennedy Memorial Stadium June 9, 2016 in Washington, DC. After a meeting with President Barack Obama earlier at the White House, Sanders said he will work with Hillary Clinton to beat Donald Trump in the presidential election. (Photo by Alex Wong/Getty Images)
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