Wisconsin had adopted a limit of $1,000 for campaign contributions to judges, but it was unclear when mandatory recusal was required. The League of Women Voters petitioned the Court to require a judge to recuse himself or herself from a proceeding if the judge had received any campaign contributions from a party or entity involved in it. Instead, during its 2009–2010 term and by a 4–3 vote, the Court adopted a rule that recusal is not required based solely on any endorsement or receipt of a lawful campaign contribution from a party or entity involved in the proceeding, and that a judge does not need to seek recusal where it would be based solely on a party in the case sponsoring an independent expenditure or issue advocacy communication in favor of the judge. Voting in favor of the new rule were Prosser, Gableman, Roggensack, and Ziegler. Voting against were Abrahamson, Crooks, and A. Bradley. In the opinion of Justice Roggensack, "when a judge is disqualified from participation, the votes of all who voted to elect that judge are cancelled for all issues presented by that case. Accordingly, recusal rules . . . must be narrowly tailored to meet a compelling state interest." In dissenting, Justice A. Bradley called the decision "a dramatic change to our judicial code of ethics" and took issue with the majority's decision to adopt a rule "proposed by special interest groups." Confrontation On June 13, 2011, a confrontation between Justices David Prosser, Jr. and Ann Walsh Bradley occurred in Bradley's chambers. Prosser, Bradley, and the other justices (except N. Patrick Crooks) were discussing the following day's decision that would overturn a ruling blocking the Wisconsin collective bargaining law. Witnesses stated that the incident happened after Prosser had stated that he'd lost all confidence in the leadership of Chief Justice Shirley Abrahamson. Bradley later accused Prosser of putting her in a chokehold. Prosser denied the allegations and asked for "a proper review of the matter and the facts surrounding it". The incident was investigated by the Dane County Sheriff's Office. Witnesses to the incident disagreed about what had happened and neither Prosser nor Bradley was charged by a special prosecutor. Ethics charges brought against Prosser based on Bradley's allegations were never adjudicated due to the lack of a quorum on the Court after recusals. Campaign expense Although elections to the Wisconsin Supreme Court are nonpartisan, campaigns for