Floyd B. McKissick (third from the left), Martin Luther King, and Stokely Carmichael (second from the right) speak to the press at a voter-registration walking march from Memphis, Tenn., to Jackson, Miss., in 1966. The original march ended when its sole participant, James Meredith, was shot with birdshot. King and the others take up Meredith's banner and complete a three-week trek that ends 15,000 strong.