BALTIMORE, MD - MAY 30: Former Maryland Gov. Martin O'Malley speaks during an event to announce his candidacy for a presidential campaign May 30, 2015 at Federal Hill Park in Baltimore, Maryland. O'Malley was the third Democrat, after former U.S. Secretary of State Hillary Clinton and Sen. Bernie Sanders (I-VT), to throw his hat in the ring for the Democratic nomination. (Photo by Alex Wong/Getty Images)
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