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President Barack Obama delivers remarks during a ceremony commemorating the 50th anniversary of the March on Washington, Wednesday, Aug. 28,2013, at the Lincoln Memorial in Washington. The president was set to lead civil rights pioneers Wednesday in a ceremony for the 50th anniversary of the March on Washington, where Dr. Martin Luther King's "I Have a Dream" speech roused the 250,000 people who rallied there decades ago for racial equality. (AP Photo/Evan Vucci) Evan Vucci/AP