Waukesha County Clerk Kathy Nicklaus says she forgot to hit the "save" button on her computer.
It was Nicklaus' human error now gives conservative incumbent Justice David Prosser with a more than 7,000 vote lead over liberal-leaning Assistant Attorney General JoAnne in the Wisconsin state supreme court race.
"It is important to stress that this is not a case of extra votes or extra ballots being found. This is human error, which I apologize for," Nicklaus said.
It has been a roller coaster ride since the polls closed, with the vote count flipping back and forth. If the 7,000-vote margin holds, it makes it unlikely that a recount will be necessary, but an army of lawyers on both sides will sort that out in coming days.