I'm guessing mitty. After all, he is the father of FF/HP.
OK, so this thread wasn't as popular as I imagined, so I'll give you what I think is the answer: I think you're right. Of the profiles I checked, the top three are:
BRTD: 4816 polls
WalterMitty: 1057 polls
Tweed: 891 polls
I doubt anyone is ahead of Mitty for 2nd place, or Tweed for third place.
That's quite a lead BRTD has over everyone else. But as I asked in his Cleveland/South Park poll, in how many of his polls does he actually vote with the majority? He seems to like to set up his polls to prove some particular point, setting it up so that there's only one "correct" answer in his mind. Yet the Atlas forum quite often picks the "incorrect" option by his reckoning.