Sounds like an interesting vid. Sniff about on the net and you will probably find some stuff but qualkity may not be good, but hey it's free.
The BBC news site has lots of archived news video but I will be darned if I can find a utility to capture thier streams for editing, believe it or not I have actuially reasorted to filming the screen as the vid plays....
Try yahoo video search too.
The prelinger archive has all sorts of stuff, I love the site.