I've said this repeatedly. Every client is reminded constantly. If I could put a disclaimer on a politician's forehead, I would. If there's a camera or microphone nearby, as far as you're concerned, it's ON.
It gets worse...because cell phone technology has made it possible to record short video, and since it seems that everyone has a link to YouTube or MySpace, you can't be safe in any public setting. Read this article in the NYTimes and see how the 2008 presidential candidates are weighing the pros and cons of using the Internet. Howard Dean embraced the Internet in 2004 and developed a formidable fund-raising/volunteer campaign...until the video of his primal scream hit everyone's Web browser, and suddenly, it was goodbye, Howie.
Again, my advice is that if you're in a leadership position that requires you to make public presentations, keep it clean from the moment you enter the room until the moment you leave. You never know when someone's watching. And recording.