Liberals like their leaders coming out of caucus, not left field. Carney bucked that preference. He not only captured the top job, he raised the Liberals Lazarus-like from the dead. But he has made the task tougher because he has created such great expectations in Canadians. And there won’t be much time to prepare for the biggest item on his early agenda—negotiating a new trade and security deal with U.S. President Donald Trump.