It appears that McCain unwisely chose to deliver his speech standing in front of a large green background.
This was naturally considered provocation by the pundidiots at the Colbert Report and they have responded with a Green Screen Challenge
You can download their McCain video here,
http://www.colbertnation.com/...
load up your chroma key editor and then submit your edited video.
I am a novice at video so I'm no competition to the experts who participated in his last challenge but I did manage to do this simple video, which I'm abnormally proud of