U.S. President Barack Obama greets Martin Luther King III the 50th anniversary of the March on Washington
U.S. President Barack Obama (L) greets Martin Luther King III at the 50th anniversary of the March on Washington and Reverend Martin Luther King Jr.'s I have a dream speech at the Lincoln Memorial in Washington August 28, 2013. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS CIVIL UNREST ANNIVERSARY)
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