There were other smaller changes elsewhere in the county affecting the final vote tally. Nickolaus said the updated tally has Prosser winning the county 92,263 votes to 32,758 for Kloppenburg. The original tally had Prosser winning 81,255 to 29,332. Prosser is set to net 7,582 votes.
Nickolaus said the error was discovered at noon on Wednesday during a post-election canvass designed to verify unofficial results.
A recount can be requested at no cost if the margin is within one-half one percent. Before the Waukesha County news broke the margin was well under the limit. But the updated results threaten to expand Prosser's lead beyond the margin necessary for a state-financed recount.
Counties are still in the process of readying official results for submission to the state, so other changes to the total may be in the offing in the coming days. But so far, the change in Waukesha County is significant when compared to the smaller swings in other counties. Earlier Thursday, smaller changes in the tally elsewhere in the state put Prosser up by 40 votes after Kloppenburg led by about a couple of hundred according to the unofficial results on Wednesday.