Simple but brilliant
I've shown this to friends and they think it's amazing how accurately the actor has emulated the voice. Only when they find out that it really is the real voices they can't believe it, so testament to how amazing well put together it is.
It's so surreal, but really well written. The animation on GWB's face is hilarious at times. The only way I can really think of to improve it is just to make it longer, and add more characters. Brilliant.