More than enough signatures have been collected in an effort to recall Republican Wisconsin state Sen. Sheila Harsdorf, organizers announced Monday.

Democratic Party of Wisconsin spokesman Graeme Zielinski said a petition will be filed with the Wisconsin Government Accountability Board on Tuesday. While he didn’t have a total signature count Monday afternoon — signatures were still coming in — Zielinski said the number is well over the 15,744 needed.

“It really was a grassroots effort by home-grown volunteers who were fed up with Sheila Harsdorf and her unholy alliance with Gov. Scott Walker,” Zielinski said of the petition. “This is an amazing feat.”

The Committee to Recall Harsdorf started March 2 in response to Harsdorf’s support of Walker’s budget repair bill, which would eliminate many collective bargaining powers for public employees.

Nathan Duerkop, spokesman for Friends of Sheila Harsdorf, said the recall effort is being driven by out-of-state and special interest groups. The Harsdorf campaign will be reviewing the petition to determine if the recall effort has enough valid signatures, he said.

“Maybe they do, maybe they don’t — we’ll find out,” Duerkop said. “If it actually does come down to an election, we are confident that the taxpayers and voters of this district will stand with Sheila.”

Harsdorf, who was first elected to represent the 10th District in 2000, lives in River Falls.

A Democratic challenger has not been announced, Zielinski said, adding “there will be more news soon” on potential candidates.

The campaign had until May 2 to collect 15,744 signatures in the district, which covers St. Croix County and parts of Burnett, Dunn, Pierce and Polk counties. The number of signatures needed is equal to 25 percent of the votes cast for governor in the district in the most recent election.

Across the state petitions to recall three other senators — Luther Olsen, R-Ripon; Randy Hopper, R-Fond du Lac; and Dan Kapanke, R-La Crosse —already have been filed with the Government Accountability Board.

Traditionally, the board would have 31 days from the filing date to determine if petitions had been filled out correctly. But due to the number of petitions — eight Republican and eight Democratic senators are being targeted — the board will be asking a judge for an extension to review the signatures, said board spokesperson Reid Magney.

“This is historic,” Magney said of the number of recall efforts. “We’ve had four recall elections for members of the legislature in state history.”

Zielinski said he believes Democrats will be able to grab a majority in the senate through the recall efforts. Currently Republicans are in control, 19 to 14.

“There are fine candidates who have announced or will announce in each of these districts,” he said. “They are not merely viable candidates, they are strong candidates capable of winning these elections for a variety of reasons.”

If the recall petitions are valid, election dates will be set for sometime this summer, Magney said. Primary elections are also possible.

Andy Rathbun can be reached at 651-228-2121