The Milwaukee Journal Sentinel said the canvass was finalized Friday and gave Prosser the win by 7,316 votes over Assistant Attorney General JoAnne Kloppenburg. The newspaper said the margin was within the limit that allows Kloppenburg to request a recount at no cost to her campaign.
The canvass was ordered after a mistake in the vote counting in Waukesha County initially gave Kloppenburg the lead in the April 5 election.
The election was being closely watched nationwide as Wisconsin officials were locked in a heated battle over plans to put sharp limits on collective bargaining for public employees.
A state investigation into the possibility of voting irregularities in the county will go back five years, the Wisconsin State Journal said Friday.
The newspaper said the Government Accountability Board wanted to look at the vote counts posted by the county clerk starting in 2006.
"We have a lot of complaints," said Kevin Kennedy, director and general counsel for GAB. "It's part of our investigation."