Harris Wofford on the Leaders of the Sixties.

Last year, Wofford won an upset victory, becoming the first Democratic U.S. Senator from Pennsylvania since 1962. He was a key aide to President John F. Kennedy, helped establish the Peace Corps, and aided Martin Luther King, Jr. He also chaired the Pennsylvania Democratic State Committee from 1987 to 1991. A new edition of Wofford's 1980 book, "Of Kennedy's & Kings: Making sense of the Sixties" has just been published.

Belafonte starred in films and helped popularize calypso music in the U.S. in the 1950s. In the '60s he became a civil rights activist. He died April 25. Originally broadcast in 1993.

On March 7, 1965, marchers from Selma, Ala., attempted to cross a bridge to demonstrate in support of voting rights. Selma director Ava DuVernay, John Lewis and J.L. Chestnut reflect on that day.