Wis. Stat. § 19.554
In addition to or in lieu of filing a complaint, any elector may file a verified petition alleging such facts as are within his or her knowledge to indicate that an election official has failed or is failing to comply with any law regulating campaign financing or proposes to act in a manner inconsistent with such a law, and requesting that an action be commenced for injunctive relief, a writ of mandamus or prohibition or other such legal or equitable relief as may be appropriate to compel compliance with the law. The petition shall be filed with the district attorney for the county having jurisdiction to prosecute the alleged failure to comply under s. 978.05(1) and (2). The district attorney may then commence the action or dismiss the petition. If the district attorney declines to act upon the petition or if the district attorney fails to act upon the petition within 15 days of the date of filing, the petitioner may file the same petition with the attorney general, who may then commence the action.
Wis. Stat. § 19.554