I strongly encourage anyone - no matter whether you like Bush or hate him, are a Democrat or Republican, or whether you can stand Michael Moore, to go see it. It's not a campaign film - it's a documentary. That's not to say that it is unbiased, or is devoid of propaganda, but it gives you the facts.
Even if you hate Michael Moore, or think Bush is the best thing since Nixon, go see this film.
After all, what do you have to fear from the truth?
A list of factual backups is here.