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Senator Bernard Sanders (I-VT) leaves after speaking as protesters gather to rally for an increase in pay to $15 USD per hour, as part of a "Fight for $15" labor effort on Capitol Hill April 22, 2015 in Washington, DC. AFP PHOTO/BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

Senator Bernard Sanders (I-VT) leaves after speaking as protesters gather to rally for an increase in pay to $15 USD per hour, as part of a "Fight for $15" labor effort on Capitol Hill April 22, 2015 in Washington, DC. AFP PHOTO/BRENDAN SMIALOWSKI        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)