actually, there is no code that enable people to edit their vote, so i suppose you will have to hire some coder to make it so.. -- this will be a good piece of hack... not easy to make for fun.

the logic of polls is that when you vote, it gives your opinion... if you change your mind, it's because you don't know what to vote... that is not democracy anymore... what we always suggest is to alert the users that the vote is fix and they just have to make their mind before voting instead of voting on a kick...