Remember Casey Knowles, the girl whose stock video from eight years ago turned up in a Hillary Clinton ad even though she is now a staunch Obama supporter? The Clinton ad, of course, did nothing wrong -- stock video is there to be used for just about any purpose, including making television ads for political candidates.

When the subject of that stock video has grown up into an intelligent, outspoken young woman, however, you might just find yourself with a bit of egg on your face if you're not the candidate she supports. Well, it's just gotten worse for Mrs. Clinton. Casey Knowles has put together her own commercial -- for Barack Obama.

In the ad, the seventeen-year-old appears very coherent and astute. Whether or not you agree with her choice in candidates, you have to give her credit for being involved and trying to make a difference.