Thanks to Kyle Simon for sharing this one with me via email.
The speeches from the political conventions are available in audio (all) and video (some) via itunes. I am sure they are available on youtube but they will probably be in higher quality via itunes.
Here are the links:
Are you planning to have your students analyze the speeches? This might be the perfect place to get them. Unless... PLEASE don't tell me that iTunes is blocked in your school, too.