Both USA Today and MSNBC have articles on whether Fahrenheit 9/11 will make a difference in this year's election. MSNBC correctly states the movie is “preaching to the choir”.

MSNBC: Attempts by GOP stalwarts to intimidate theater owners into refusing the film have only generated more demand at the box office. “Fahrenheit 9/11” broke all opening-day records in New York, out distancing “Mission Impossible” and “Men in Black.” Noting that President Clinton’s memoir, “My Life,” is also setting record sales, a pleased Terry McAuliffe, the Democratic Party chairman, said, “It must be driving them nuts,” them meaning the Republicans.

The strenuous efforts of right-wing activists to curtail the showing of the movie suggest they understand the potential impact of this film. Because “Fahrenheit 9/11” is a cultural phenomenon, it just might attract the young and the politically unaffiliated, voters with the power to defeat Bush.

USA Today does a pretty good job of discussing the issue:

The film "will turn Bush-haters into bigger Bush-haters," says Jack Pitney, a professor of government at California's Claremont McKenna College. "But swing voters may not even be interested in this subject, and Republicans don't want to turn any money over to Michael Moore."

Larry Sabato, a University of Virginia political scientist, says the savage portrayal of Bush "could convince some Naderites" of the need to vote for Kerry. Moore, who backed Nader's independent candidacy in 2000, says that's one goal. "I hope to have a significant impact on the 4-6% who now say they're going to vote for Ralph," he says.

The USA Today article goes into a lot more detaila and is worth checking out.