Thousands Gather on National Mall To Mark 1963 Civil Rights March

Organizers expect 100,000 people to attend

People are assembling on the National Mall to commemorate the 50th anniversary of Martin Luther King Jr.'s 1963 March on Washington, best known as the venue for the iconic "I Have a Dream" speech that helped galvanize the civil rights movement.

Organizers, including the Rev. Al Sharpton and King's son, Martin Luther King III, say they expect 100,000 people to attend Saturday's events leading up the official Aug. 28 anniversary.