Michael Moore is at work on a sequel to Fahrenheit 9/11, his hit documentary about the Iraq war, with plans to release it next spring when a new administration is installed in the White House. The film is being jointly financed and distributed by Overture Films, a subsidiary of John Malone's Liberty Media, and the Paramount speciality subsidiary Paramount Vantage. The studios said Tuesday that Moore had agreed to a delay in the release so that it would not appear to be taking sides with any candidate. The original film was the most successful documentary ever made -- grossing nearly $220 million worldwide.