If I made a mistake downvoting or upvoting a post, there's no way for me to fix that unless asking the person to edit its answer.
Let's say I downvote something, then explain in a comment thinking that I'm right and the user's wrong. The user convince me that he was right in the first place and that I should not have downvoted him (everybody make mistakes or it could have been a misundertanding on words... whatever). Then I can't undo my downvote.
I get the point of forbidding removing up/down votes without edit, but in some cases it gets annoying.
Could it become so that one can undo his vote if a comment is left by someone else (to avoid dummy comments just to rollback a vote) ?
EDIT: Added a bounty to get more feedback