The following link is to a video by an OIF veteran, with a message to Senator Obama. The video is one of the most watched political videos on youtube.
http://www.youtube.com/watch?v=TG4fe9GlWS8
The BBC has an article discussing personal political videos and mentioning this one in particular.
http://news.bbc.co.uk/2/hi/americas/...08/7699509.stm