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MONTREAL – Prime Minister Mark Carney’s message to his party is that differences are a strength, as the Liberals stand on the cusp of a majority government in the House of Commons, with help from floor crossers from other political parties. “Canada’s founding insight is that unity does not require uniformity,” he said during a closing speech at the Liberal national convention in Montreal on Saturday afternoon. “Pragmatic decisions that have become a moral conviction — that our differences are a strength to be nurtured, not a risk to be managed.” Carney’s government has attracted...