Fifty years after King’s historic march, the struggle for racial justice faces unprecedented challenges. They carried signs that demanded “Voting Rights,” “Jobs for All” and “Decent Housing.” They protested the vigilante killing of an unarmed black teenager in the South and his killer’s acquittal. They denounced racial profiling in the country’s largest city. This isn’t 1963 but 2013, when so many of the issues that gave rise to the March on Washington [...]