matthewwhatever
Member
Please let it be Nathan Cullen. I've always had a soft spot for him, especially during the NDP leadership race.
As a Liberal, he terrified me. He would've picked up Layton's Happy Warrior mantle, and he would've made it harder for Trudeau to jump into the Liberal leadership and define himself as a fresh face. (It also would've helped Joyce Murray's campaign significantly, since she was the pro-merger candidate on the Liberal side). I'm not sure he works quite as well against Trudeau now, but he'd still be a pretty formidable leader.