Watch The Debates lets you view all the Presidential debates since 1960, including clips categorized by subject. You can then indicate your thoughts about what is being said, and compare your reactions to others.
It’s unclear to me how quickly they will upload this year’s debates. Even if it takes awhile, though, it’s a very useful site for classes.
I’m adding it to The Best Sites To Learn About The 2016 U.S. Presidential Elections.