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WASHINGTON, DC - AUGUST 28: U.S. President Barack Obama (L) and first lady Michelle Obama wave as they leave at the end of the Let Freedom Ring ceremony at the Lincoln Memorial August 28, 2013 in Washington, DC. The event was to commemorate the 50th anniversary of Dr. Martin Luther King Jr.'s 'I Have a Dream' speech and the March on Washington for Jobs and Freedom. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - AUGUST 28:  U.S. President Barack Obama (L) and first lady Michelle Obama wave as they leave at the end of the Let Freedom Ring ceremony at the Lincoln Memorial August 28, 2013 in Washington, DC. The event was to commemorate the 50th anniversary of Dr. Martin Luther King Jr.'s 'I Have a Dream' speech and the March on Washington for Jobs and Freedom.  (Photo by Alex Wong/Getty Images)