John Mbugua and his son Giovanni Mbugua, 6, of San Jose, Calif., and Lavon Johnson and his son Mason Johnson, 2, of Fort Meade, Md., greet one another while marching with thousands of other people from Capitol Hill to the Lincoln Memorial on Wednesday. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

Listen: NPR Special Coverage Of The March On Washington Anniversary

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Civil rights leader Martin Luther King waves to supporters from the steps of the Lincoln Memorial on Aug. 28, 1963, in Washington. AFP/Getty Images hide caption

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AFP/Getty Images

Under Construction: A recent survey of Americans found that fewer than half believe the U.S. has made substantial progress toward racial equality. Here, the Martin Luther King Jr. Memorial in Washington, D.C., is boxed in by scaffolding as work is done on it. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP