In the Loop is a reality-based political spoof about political interactions between the US and the UK in the run-up to the Iraq war. It is also one of the two or three funniest movies I've seen this year. I particularly enjoyed "Chad" (love that name), the truly nasty little 20-something wonk brown-nosing his way to power. DC is full of such people, a subset of whom are selected out by a tough process of winnowing to become members of Congress. The US-UK interactions are perfect as well, perhaps because the film was made by the BBC.
Highly recommended.