Well, I voted early and told the exit pollster that I voted for Kerry.
If the polls showed Kerry winning it might motivate lazy Bush voters to show up.
Also, some Kerry voters might get over confident and stay home.
Always lie to pollsters.
I saw one guy, he had a Kerry/Edwards shirt. I told him I had no time, had to catch a train work, he followed me almost demaning who I voted for. i told him to guess, guess he marked me down a Dim