March on Washington anniversary celebrations

A rally on the National Mall celebrates the 50th anniversary of the March on Washington and the Rev. Martin Luther King Jr.’s “I Have a Dream” speech.   (Pete Marovich / Getty Images)

Martin Luther King III waves from the Lincoln Memorial with his wife, Arndrea King, and their daughter Yolanda.  (Carolyn Kaster / Associated Press)

Tens of thousands line the National Mall at the rally honoring the 50th anniversary of the March on Washington.  (Paul J. Richards / AFP/Getty Images)

People listen to speakers during the 50th anniversary celebration of the March on Washington at the National Mall.  (Olivier Douliery / McClatchy-Tribune)

People gather in Washington for the 50th anniversary of the March on Washington and Martin Luther King Jr.’s “I Have a Dream” speech.  (Mark Wilson / Getty Images)

Tens of thousands gathered at the National Mall to celebrate the 50th anniversary of the March on Washington.  (Pete Marovich / Getty Images)

People arrive at the National Mall to celebrate the 50th anniversary of the March on Washington.  (Pete Marovich / Getty Images)

Marchers commemorate the 50th anniversary of the March on Washington.  (Paul J. Richards / AFP/Getty Images)