Michael Moore is getting wise to the virtues of free/open culture. Starting September 23, you can download his new film – Slacker Uprising – via the web for free. The unfortunate rub is that this download will only be available to US and Canadian residents, and it will remain free via the web for three weeks. You can get more info and sign up to download the film here. Below, you can also preview the film, which (surprise, surprise) ties into the American election.