Is Michael Moore a Double Agent?

A June 29, 2007 entry by Katherine Mangu-Ward on Reason magazine's blog seconds the view of ACSH's Todd Seavey that Sicko director Michael Moore is too extreme for his own good:

Seavey's conclusion: "If Moore had stopped about one third of the way through his film, after sharing some genuinely funny/infuriating tales of insurance bureaucracy gone awry...he might well have had the majority of the audience on his side, even the right-leaning or free-market-oriented viewers. But if he knew when to stop, he wouldn't be Michael Moore, would he?"