If the author of a question ever selected an answer that was clearly wrong can a moderator ever de-select the wrong answer?
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$\begingroup$ This is why all other users can upvote, right? $\endgroup$ – Bernhard Dec 4 '12 at 21:11
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Moderators cannnot change the accepted answer, but they can delete an accepted answer. In general, choosing the accepted answer is the decision of the user asking the question alone.