Actually I think that 1) Moore's film was a clear case of "preaching to the choir" and 2) the string of stories debunking his assertions are having the exact OPPOSITE affect that Moore intended, that is to get "swing" voters to vote against Bush.
Despite the box office numbers very VERY few people have seen this movie. It took in 21 Million. At 8 bucks a pop that's only 2.6 million people or less than 10% of the population. I guarantee the majority of those people weren't going to vote for Bush to begin with.
The swing voters who didn't see the movie heard the hype pre-release and are now seeing the post-release stories calling the movie a load of crap. Many won't even bother to go and see it and if they do they will have the follow up stories to gauge what they are seeing.
In a couple of months the movie will be forgotten. The next time we hear about it will be during Oscar time next year.
I agree that they were mostly Dem Kool-aid drinkers, and, happily, not even 1% of the US population.