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Possible Duplicate:
Are there any voting limits?
Cancel a vote so that the tally goes back to zero and not minus
Cancel Vote (Up Vote/Down Vote)
Is it possible to cancel vote?
Suppose I voted on a question. But later I realise that this question does not deserve vote. So how can I cancel my vote?
Yes, you simply click the arrow again.
That is, to remove an upvote, click the up arrow and to remove a downvote click the down arrow. You should already see it highlighted — clicking again will remove the vote and highlight.
However, there is a time limit on this. You only have about 5 minutes in which to change your mind unless the question or answer has been edited in the meantime. This is to prevent gaming of the system whereby you down-vote all competing answers and then when your answer is accepted or clearly ahead in votes revoke the down-votes.
If you realise it soon enough, you can simply remove your vote by clicking the arrow again. If it is too late for that, you can remove your vote only after the question has been edited.
