lol! I've had that one on my pc for almost a month now. Zoe just loves it (as do I), and knows all the words. She sings it in the shower, and every now again she pops her head around the door with a lyric question - "Mum, what does 'liberal weiner' mean?", etc.
The one that brought tears to my eyes was Clinton baking Brownies, though. Have you seen it? (I tried to get the link, but JibJab animations aren't up at the mo - too many peeps lookin' at This Land).