Michael Moore has never pretended to be an objective journalist.  He is an 
artist and a provacateur, and would probably own up to being a propagandist.  
But he productively influenced the discourse about the Iraq war and now has 
everyone talking about the dreadful U.S. health care system.  

Incidentally, it was conclusively shown that there was never a horse, a cow 
and a light bulb present in the same place during the bombing of Guernica.