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BALTIMORE, MD - APRIL 23: Democratic presidential candidate U.S. Sen. Bernie Sanders (D-VT) speaks during a campaign event at the Royal Farms Arena April 23, 2016 in Baltimore, Maryland. Maryland will hold its 2016 primary election next week on Tuesday April 26th. (Photo by Mark Wilson/Getty Images)

BALTIMORE, MD - APRIL 23: Democratic presidential candidate U.S. Sen. Bernie Sanders (D-VT) speaks during a campaign event at the Royal Farms Arena April 23, 2016 in Baltimore, Maryland. Maryland will hold its 2016 primary election next week on Tuesday April 26th.  (Photo by Mark Wilson/Getty Images)