Michael Moore is many things--filmmaker, TV-show producer, best-selling author, hall-packing lecturer--and has been called many other things by his detractors. But first and foremost, he's a movie star.
The numbers for his past three pictures prove that: Bowling for Columbine, Fahrenheit 9/11 and Sicko have together earned more than $300 million worldwide. Not all this boodle can have come from people who agree with his populist-lefty agenda. No, they pay to see him play "Michael Moore": a heavyset fellow with a doofus grin, alternately laughing and badgering but perennially at the center of attention. For all his girth, Moore fits the...