I suggest a badge that would be awarded (one time only) for achieving EXACTLY 200 reputation in a single day. Votes above that would disqualify the user from achieving the badge; they should not have any "wasted" reputation. I'd also suggest disqualifying bounties from the consideration for this badge; otherwise a +200 bounty would make it too easy to hit.
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No. This doesn't encourage any positive behavior. Further I think it would encourage the paraniod questions -- why did I get downvoted in the last second of the day?? This friggin Troggy user didn't like my idea and just wanted to prevent me from getting my badge.