Can Trudeau survive Liberals’ stunning Toronto byelection loss?

The federal riding of Toronto-St. Paul’s has long been held by the Liberals since 1993 — until now. The Conservatives’ Don Stewart has won the seat in a byelection, igniting questions about the future of the Liberals and Prime Minister Justin Trudeau. Eric Sorensen looks at what history tells us about political leaders who stay in the job for a long time, and what one poll says about the interest in rumoured successors to Trudeau.

• The message in Toronto-St. Paul’s loss is ‘loud and clear,’ minister says