Over the past few days, Canada and Australia have held national elections. And in both, the centre-left party triumphed over right-wing challengers, whom the electorate identified with Trumpism. In Canada, Prime Minister Mark Carney, who fought and won the job when Justin Trudeau resigned unexpectedly at the beginning of the year, called a snap election shortly after taking office and then triumphed handily following the shortest legally permissible campaign. This was an extraordinary reversal of fortune. At the end of last year, insurgent conservative leader Pierre Poilievre was ahead in the polls by 25 percentage points. Yet the arrival of Mr Trump in Washington, his imposition of punitive tariffs on Canada alongside jibes about Canada becoming the 51st state of the US made all the difference. Mr Carney’s determination in the face of these challenges turned his party’s fortunes around.