The governor of the Bank of Canada was under scrutiny. For weeks, press reports had tied Mark Carney to a potential run for the country’s Liberal Party, which was looking for a new leader. Central bankers are supposed to stay away from politics, but Carney had not snuffed out the speculation. One day in late 2012, after another reporter asked him if he was thinking about becoming a politician, he snapped back. “Why not become a circus clown?” he said. A dozen years later, Carney has finally