Open this photo in gallery: Speaker of the House of Commons Greg Fergus takes part in his first official Speakers Parade on Parliament Hill in Ottawa on Oct. 4.Sean Kilpatrick/The Canadian Press Greg Fergus’ impartiality as Speaker of the House of Commons is headed for study by a committee of MPs, after he appeared in a video tribute that played at this past weekend’s Ontario Liberal convention. In the video, Mr. Fergus, dressed in the Speaker’s robes and standing in the Speaker’s office, praises interim Ontario Liberal leader John Fraser, whose tenure ended Saturday with the election of Bonnie Crombie...