The front-runner is Marlon Brando. Pauline Kael called it in the Atlantic in 1966:

"He was our angry young manthe delinquent, the tough, the rebelwho stood at the center of our common experience. When, as Terry Malloy in On the Waterfront, he said to his brother, "Oh Charlie, oh Charlie ... you don't understand. I could have had class. I could have been a contender. I could have been somebody, instead of a bumwhich is what I am," he spoke for all our failed hopes. It was the great American lament, of Broadway, of Hollywood, as well as of the docks."

But he hasn't won yet. Alas, Monday's entries still have many more votes than the other days - a function of timing. You can tilt that by voting for the leaders in the other four lists. Vote often if you're a real fan. So far, the runners-up are Apocalypse Now, Cool Hand Luke, Casablanca, and this:

You can still vote for any of the forty-five others, of course. Where are the Star Wars fans?