“This time, on this issue, there must be no delay, no hesitation and no compromise with our purpose. We cannot, we must not, refuse to protect the right of every American to vote in every election that he may desire to participate in. . . . We have already waited a hundred years and more, and the time for waiting is gone. . . . For from the window where I sit with the problems of our country I recognize that outside this chamber is the outraged conscience of a nation, the grave concern of many nations, and the harsh judgment of history on our acts.”