Well, after a day of polling, it seems that most people have indeed voted in this poll only one time. This isn't very suprising, as the message board software only allows you to vote once.
Interestingly, several people have voted more than four times. Since no one has voted 2-4 times, I am forced to conclude that these people are either (a) moderators or (b) filthy stinking liars. Possibly both.