This question already has an answer here:  It's alright that
users aren't allowed to upvote their own posts. But, what about
downvote?  Users can mis-use upvote, but users can't mis-use
downvote.  Add this feature.. With it, a user can downvote his
question/answer at later point of time when he finds that it's
poor. Today, I was trying to do that, but failed.  share|improve
this question Ehm, if your answer is poor, improve or remove it?
–  Bart Jun 21 '12 at 6:16 That's just.. silly. No offense
meant. Like Bart said, if you think your own answer is poor,
improve it. If it's beyond fixing, delete it. What you suggest
is like the option to give yourself a loan in the bank or
something like that. –  Shadow Wizard Jun 21 '12 at 6:24 dont
worry we can do it for you:P –  Jeremy Thompson Jun 21 '12 at
6:36 Voting is not some arbitrary thing. It's supposed to
influence your reputation. You should not have influence over
your own reputation. –  meagar Jun 21 '12 at 15:11 @meagar I
know that. Think how great I am.. – 