Democratic presidential candidate Sen. Bernie Sanders, I-Vt., raises his fist in the air during a campaign rally at Milton High School in Milton, Mass., Monday, Feb. 29, 2016. (AP Photo/Jacquelyn Martin)
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Democratic presidential candidate Sen. Bernie Sanders, I-Vt., raises his fist in the air during a campaign rally at Milton High School in Milton, Mass., Monday, Feb. 29, 2016. (AP Photo/Jacquelyn Martin)
