Oh no, it doesn't do that. That's all recorded in the database, so you won't have SBd the same person twice unless they have been banned in the interim.
As far as polls are concerned, they're just a bit of fun, so I don't think it really matters (well not enough to store a large amount of data like what everyone has ever voted for).
Also, it's dead easy to spot sockpuppet voters on SBs. I just removed four of them from Lex's votes the other day.
― Keith, Tuesday, 14 July 2009 07:43 (fourteen years ago) link