The Missouri Commission on Retirement, Removal, and Discipline of Judges charged Judge Matthew Thornhill with misconduct:
That Respondent engaged in a course of conduct in which he was involved in political activity not related to the law, legal system, or the administration of justice and/or was related to his own political campaign from the bench in the courtroom while conducting the business of the court and/or around the courthouse in one or more of the following ways:
- That on occasion Respondent would mention his political affiliation and/or his preferred candidates in contested political elections with litigants, witnesses, and/or attorneys while conducting court business from the bench in the courtroom.
- That on occasion, Respondent would comment from the bench in the courtroom to litigants, witnesses, and/or attorneys about where his "Thornhill for Judge" signs were located.
- That on occasion, Respondent would remark from the bench in the courtroom to litigants, witnesses, and/or attorneys that they live in, "Thornhill for Judge Country."
- That on one occasion, while considering the petition, Respondent asked the petitioner if the union for which the petitioner worked has, "[w]armed up to Thornhill for judge."
- That on occasion, Respondent would, from the bench in the courtroom, ask litigants. witnesses, and/or attorneys where they lived and if they had seen his campaign signs.