Dennis Wilenchik successfully argued the appeal to the Arizona Supreme Court on behalf of former Attorney General Horne in his campaign finance case. A copy of the Court’s Opinion can be found here.
See also, from the Arizona Republic: http://www.azcentral.com/story/news/politics/arizona/2017/05/25/arizona-court-former-attorney-general-tom-horne-denied-due-process-campaign-case/345943001/