Mr. Smith Goes to Washington

Jefferson Smith is an idealistic, small-town young man who suddenly finds himself a United States senator. Placed in his position by a rich, power-hungry man, Mr. James A. Taylor, Smith is not supposed to do anything but vote on a bill, allegedly constructed as a relief bill, but actually concocted to fill the pockets of Taylor. When Smith uncovers the plan and tries to tell the senate the truth, he finds himself engaged in an overpowering battle against the unbelieveably powerful Taylor. But against overwhelming odds, Smith keeps fighting, and the quote below is from the climax of this fight, and actually the whole movie. Ahem I quote from memory, so it's not quite word for word.

I guess this is just another lost cause Mr. Payne. All you people don’t know about lost causes, Mr. Payne does. He said once they were the only causes worth fighting for, and he fought for them once, for the only reason that any man does. Because of just one simple rule; Love thy Neighbor. And in this world today full of hate a man who knows that rule has a great trust, you know that rule Mr. Payne, and I loved you for it just like my father did. And you know that you fought for the lost causes harder then any others, you even died for them, like a man we both knew.
You think I’m licked, you all think I’m licked. Well I’m not licked. I’m gonna stay right here and fight for this lost cause, even if this room gets filled with lies like these. And all the Taylors and Paynes come marching in. Somebody will listen to me.

Starring James Stewart (in what I personally think is his finest performance) this is an incredible movie, and I VERY highly reccomend it.