With some simple coding, I believe the vBulletin classes could be manipulated to obtain this. It could allow you to create a thread, add a poll to the thread, and lock the thread (and hopefully still allow voting). This would be done through plugins and/or straight files. With some more work, I am sure you can work the data so that you check to see if a user voted or not.
But I do not believe there is a hack available for that.
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