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UNITED STATES - JULY 22: Democratic presidential candidate Sen. Bernie Sanders, I-Vt., prepares to speak to federal contract workers during a rally on Capitol Hill in Washington, Wednesday, July 22, 2015, to push for a raise to the minimum wage to $15 an hour. (Photo By Al Drago/CQ Roll Call)

UNITED STATES - JULY 22: Democratic presidential candidate Sen. Bernie Sanders, I-Vt., prepares to speak to federal contract workers during a rally on Capitol Hill in Washington, Wednesday, July 22, 2015, to push for a raise to the minimum wage to $15 an hour. (Photo By Al Drago/CQ Roll Call)

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