I know this a 2 month old post, but I post over there and I actually have 1000+ posts. I do a very stealth FReep and no one would dare accuse me of being insincere.
The trick is to play nice your first few hundred posts, and then you can point out the obvious fallacies in their DUmb arguments, and incite fear, Kerry isn't a "true liberal," support Nader, et al.
Election night is going to be very entertaining.
I actually try to stick to my pledge not to lie, although it's very hard to find something I agree with them about. I stay away from the main discussion forum, but on some of the other boards I can find things I slightly agree with, and post in those topics.
Just as an aside, but how in the world did you get over 1000 posts?
I start feeling suicidal if I spend too much time there.