March on Washington

People take shelter from the rain during the ‘Let Freedom Ring Commemoration and Call to Action’ honoring the 50th anniversary of the historic March on Washington D.C.  (Chip Somodevilla / Getty Images)

Marchers walk from Capitol Hill to the Lincoln Memorial during the “Let Freedom Ring Commemoration and Call to Action” honoring the 50th anniversary of the historic March on Washington for Jobs and Freedom in 1963, the landmark civil rights event where Dr. Martin Luther King Jr. delivered his famous “I have a dream” speech.   (Chip Somodevilla / Getty Images)

John Mbugua and his son Giovanni Mbugua, 6, of San Jose, left, and Lavon Johnson and his son Mason Johnson, 2, of Fort Meade Md., greet one another while marching with thousands of others during a march honoring the 50th anniversary of the historic 1963 march on Washington.   (Chip Somodevilla / Getty Images)

Emcees Soledad O’Brien, left, and Hill Harper open the “Let Freedom Ring” ceremony to commemorate the 50th anniversary of the march on Washington.   (Shawn Thew / EPA)

People put up with light rain near at the Lincoln Memorial in Washington to commemorate the 50th anniversary on the march on Washington, best remembered for King’s stirring vision of a United States free of inequality and prejudice, telecast live to a nation undergoing a phenomenal decade of soul-searching, crisis and change.   (Jewel Samad / Getty Images)

With Trayvon Martin parents, Sybrina Fulton, and Tracy Martin, Peter Yarrow, left, and Paul Stookey, right, of the folk trio Peter, Paul and Mary, perform at the 50th Anniversary of the March on Washington where Martin Luther King, Jr., spoke, Wednesday, Aug. 28, 2013, in front of the Lincoln Memorial in Washington. Man at center is unidentified.  (Charles Dharapak / Associated Press)