A Face in the Crowd is a good one from Elia Kazan. Though not 100% about politics, it is about the cult of personality and how it bleeds over into everything including politics.
whomod said: I generally don't like it when people decide to play by the rules against people who don't play by the rules. It tends to put you immediately at a disadvantage and IMO is a sign of true weakness. This is true both in politics and on the internet."