Former Bank of Canada governor Mark Carney launched his campaign to become Liberal leader and Canada's next prime minister on Thursday. Carney, who has long been tied to Trudeau, criticized the current government's handling of the economy and promised to do better. He's expected to be up against candidates including former finance minister Chrystia Freeland and Liberal House leader Karina Gould, who sources say will enter the race over the weekend. Power & Politics hears from three Liberal MPs each supporting a different contender.