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Possible Duplicate:
Mistaken downvote cannot be undone after matter is being clarified by the answerer

If I press the upvote or downvote by mistake and later I realize that I want to cancel the effect and bring it back to what it was before, then I don't find option to do it.

It just happened today; I downvoted instead of giving it an upvote. Later I thought by giving it a downvote will cancel the effect of upvote but nothing. Can someone throw some light on this behavior of voting?

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marked as duplicate by Shadow Wizard, Cody Gray, Jeff Atwood May 19 '11 at 9:21

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

You can ask the OP to edit the question then you'll be able to undo. – Shadow Wizard May 19 '11 at 8:26
up vote 4 down vote accepted

A vote gets "locked in" after 5 minutes. After that, you can only change it if the post gets edited.

See also this question for more info:

Vote too old to be changed, unless post is edited

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