click today. >>> the trayvon martin tragedy is getting worldwide attention from protests in london to the florida city where the shooting happened. and the story could make history. joining me now is presidential historian dougene rivers. i'm glad you're both here. >> good morning. >> good morning, alex. >> douglas, i will speak with you first. we can't see how this will be viewed in history, but we certainly have moments in history that even this early we can look at for comparison. right? >> well, certainly. i mean, the civil rights movement after the brown versus topeka decision in 1954 was triggered in many ways by the murder of emmett till in mississippi. the young boy, emmett till, had his eyes gouged out and was strangled, had a cotton gin tied to his neck and he was thrown into the tallahatchie river. it was his mother who kept an open coffin and said look what they do in the jim crow south, they killed a little boy, my son, emmett till, and it galvanized rosa parks. without that, row is is a parks wouldn't have had her moment of dissent on december 1, 1955, and the same with medgar evers of the naacp in mississippi. edgars simply wanted african-americans to have the right to vote. he was a marine. h