<p>Today, I accidentally up voted an answer, while intending to up vote <em>another</em> answer.</p>

<p>To undo this, I hit the down vote button, but after that, I had down voted the answer.</p>

<p>So I up voted it again, because I felt sorry for the author.</p>

<p>Question: is there no way to <em>undo</em> a down or up vote on an answer?</p>
