Charlie Wilson's War (2007)

It's good as a sort of primer into political logrolling while describing how one liberal Texas representative got America to fund a successful war by Afghans against the Soviets for only about $1 billion. Interesting oblique criticism of the war in Iraq is slipped into the dialogue in places. The film also highlights the opportunity lost -- this successful war was not supported in the end with economic aid in a way that could have led Afghanistan to liberal or western leaning democracy.