An American Carol is a terrible movie with some spot-on satire. First of all, it was written and directed by David Zucker, one of the minds behind Airplane, The Naked Gun, and such classics. In case you're not familiar with those gems, you should know that they are full of silliness, offensive humor, and political incorrectness. With that same tone, An American Carol takes on anti-American biases in the press and liberalism in politics.
This is a movie for: people who can't stand Michael Moore, "red-meat" conservatives with a low-brow sense of humor, and people with too much time on their hands so they can afford to waste time watching bad movies. They do make some good points in absurd, over-the-top, humorous ways, but this kind of movie won't be doing much to move the arguments.
Bottom line, 1 1/2 stars.