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Jeff Atwood
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To help deal with the "tactical downvoting" problem, we have radically reduced the window for undoing votes.

There is now only the very briefest of windows where you can undo a vote.

After that, the vote is permanently "locked in", until the post is edited. Once the post is edited you may vote for it again.

Jeff Atwood
  • 299860
  • 103
  • 854
  • 1232