The count was corrected on the first day that counties were in the process of verifying unofficial vote totals reported Tuesday. The race was so close, despite 1.5 million votes being cast, that the lead flipped back and forth repeatedly on election day and in the days after as those preliminary totals were checked and updated.

Gov. Scott Walker said before details of the new votes were announced that voters will demand transparency.

"The overriding principle has got to be that every vote that was legally cast in Wisconsin needs to be counted," Walker said.

The discovery of votes that could give Prosser the win and quash any recount before it starts had liberal groups crying foul.

"There is a history of secrecy and partisanship surrounding the Waukesha County clerk and there remain unanswered questions," said Scot Ross, director of the liberal group One Wisconsin Now.

He added, "Her computers need to be seized and a forensic expert needs to go through them as if a crime could have occurred."

And Citizen Action of Wisconsin called for a federal investigation into the situation.