O'Leary, Leitch, & Mesley are deserving choices.Probably Peter "Capt. Canada" Mansbridge too for the reason cited (retiring on air on Canada Day). 

Mesley I find most irritating when she's interviewing someone. Her attempts at "serious" questions too often come across as hostile more than "hard". I'll refrain from using a "B" word.  I recall it was painful watching her interview John Stewart because she couldn't refrain from asking questions so hostile and in such  a nasty tone that an obviously uncomfortable Stewart complained about it to her. Sadistic Mesley often will ask mean, cutting questions followed by squinty grins.She evidently enjoys making interviewees squirm. I never liked Mesley's style, and never understood why the Mothercorp always coddled and championed  her.

Leitch: peculiar

O'Leary was a fairly obscure TV personality on BNN until CBC poached him from BNN, & gave him not one but two regular CBC gigs. CBC made O'Leary a media star. "Thanks" (not) CBC.