Um, no. This would be the best possible way to get Kerry elected. The left is running around ranting that Bush is a fascist, and if Bush and Ashcroft try to throw a vocal critic in prison suddenly they'll have a point. The correct response is to either ignore Moore, or point out at every opportunity that he's a lying anti-American scumbag.
Also prosecutions for treason in the history of this country are 1) often unsuccessful 2) virtually non-existent.