From George Washington To Barack Obama - 44 Presidents of the United States
The video is created with a Face Morphing program...It's set to the music of Maurice Ravel's Boléro.
The person who created this video must've put a lot of time and effort into the morphing all those faces...
by http://www.youtube.com/user/poldivideo
h/t: Silent Patriot - Crooks and Liars