This movie is more like "The Big One" - a Moore film for Moore fans (like myself - I have every episode of "The Awful Truth" and "TV Nation").
As for whether he hurt Kerry or not, I don't think so....
He does rev up BOTH bases and the barbs back and forth over who is lying and who is not leave most of America scratching their heads. But at worse, I think it was a wash.
But I think Jon Stewart has one thing that Moore does not... Moore presents things like he has all the answers. Jon is so self deprecating you think he has none of the answers and is the blind squirrel that came across an acorn when he finds something damning.