Obama's nomination speech at Invesco Field. Folks waited in line for 6 miles to see him. It's a good one. Definitely worth your 50 minutes.
It was so good, Pat Buchanan loved it. (In case you don't know, Buchanan is a far-right whack job, e.g. regarding AIDS: he believes homosexuals have "declared war upon nature, and now nature is extracting an awful retribution".)