Great thread!
Here is one of the most inspirational videos I've ever seen. It really gets amazing a couple minutes in, but you might cry:
[yt]http://www.youtube.com/watch?v=o6Alt2DssYc[/yt]
Here is one I recently watched, and boy, is it worth watching through to the end. The lyrics at the end are particularly powerful. Mister Rogers addresses the Senate on behalf of funding for Public Broadcasting in 1969:
[yt]http://www.youtube.com/watch?v=yXEuEUQIP3Q[/yt]