In this Aug. 28, 1963 photo, The Rev. Dr. Martin Luther King Jr., head of the Southern Christian Leadership Conference, addresses thousands of civil rights supporters gathered in Washington, D.C. (AP Photo)
The Rev. Martin Luther King Jr. delivered his famous “I Have a Dream” speech to hundreds of thousands of people gathered in Washington in 1963. (AP photo)
Leaders of the March on Washington stand with Sen. Everett Dirksen, R-Ill., center right, during a visit to the Capitol on Aug. 28, 1963.(AP Photo)
A tourist points to the exact location where Rev. Martin Luther King Jr., gave his famous 'I Have a Dream' speech, at the Lincoln Memorial in Washington, Thursday, Aug. 22, 2013, in Washington. (AP Photo/Carolyn Kaster)