Yes, the ability to undo a vote would be useful. Shouldn't be that hard to implement, either, given that the site already keeps track of who has upvoted what.
I have also noticed that pg's comments have unusually high ratings, whether or not the actual content was unusually good.
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I admit I am guilty of this. Often I realize it after I clicked vote up, but alas, by then it is too late.
Yes, the ability to undo a vote would be useful. Shouldn't be that hard to implement, either, given that the site already keeps track of who has upvoted what.
I have also noticed that pg's comments have unusually high ratings, whether or not the actual content was unusually good.