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Fifty years ago today, hundreds of thousands of people gathered on the National Mall to demand action on civil rights and jobs. The most famous speech of Aug. 28, 1963, was the Rev. Dr. Martin Luther King Jr.’s, the last one on the program, with its ringing—and entirely unscripted—repetition of “I have a dream.” You can watch that one above.

You can also, if you’re not heading to the Mall for today’s 50th anniversary commemoration, watch PBS’s live stream here:

Live streaming video by Ustream