Martin Luther King Jr., with his wife, Coretta, at a Harlem hospital after he was stabbed by Izola Ware Curry in 1958. AP hide caption

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Historian Peniel Joseph says criticism of the film Selma as historically inaccurate is misguided, and that the movie correctly portrays African-Americans as the drivers of the civil rights movement. Kelvin Ma/Peniel Joseph hide caption

itoggle caption Kelvin Ma/Peniel Joseph

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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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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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

itoggle caption Pablo Martinez Monsivais/AP