"Martin Luther King didn't stand on the steps of the Lincoln Memorial and say, 'Go home everybody. The dream is deferred, false hopes. You need a reality check.' There is a moment in the life of every generation, when that spirit of hopefulness has to come through, if we are to make our mark on history..."
Thanks to Andrew Sullivan's blog. That's where I first saw this video, the last 10 minutes or so of Obama's recent speech in Wisconsin.