Few times I have decided to change my vote. The problem is that when originally answer is 0 and I vote up and after some though I want to reverse my vote, it goes to -1 vote.
Why not 0?
I don't want to vote for negative, just reverse my vote...
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Don't down vote, just click on the up-vote to undo the up-vote.
Note your vote will be locked a few minutes after you vote, so you can't change it unless the question has been edited since you voted.