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WASHINGTON, DC - FEBRUARY 26:  A guest gives a thumbs up sign as U.S. President Barack Obama delivers remarks during an event in the East Room of the White House on February 26, 2015 in Washington, DC. Obama paid tribute to African American heroes of the civil rights movement during a reception marking Black History Month.  (Photo by Win McNamee/Getty Images)
WASHINGTON, DC - FEBRUARY 26:  A guest gives a thumbs up sign as U.S. President Barack Obama delivers remarks during an event in the East Room of the White House on February 26, 2015 in Washington, DC. Obama paid tribute to African American heroes of the civil rights movement during a reception marking Black History Month.  (Photo by Win McNamee/Getty Images)

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