Idiocracy, 2005.
By Mike Judge of Beavis and Butthead fame, so the jokes are sometimes purile but always funny. He imagines a world where the stupid are in charge, his White House is a chaotic circus where nobody knows what they are doing. Don't be alarmed, it's only a movie, nothing like that could ever happen in real life. It's hard to find a copy of this, a certain vulpine organisation didn't want the film to be a success, but you can watch it free on Veoh right now.