Probably a nutty request, but I wonder if it's possible to restrict voting on an additional criterion (aside from the current ones of cookie and IP) to ensure / enforce that a voter has to be registered, logged in and can only vote once per poll.
Can user ID be added to the restrictions? If so, how would / could I accomplish that?
If you wonder why: it's in the context of a members-only site, and I'm pondering the use of Polldaddy for an, ahem, election conducted online. No, I am not the owner of or otherwise affiliated with Diebold. =)