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Conservative Leader Stephen Harper, Canada's prime minister, attends a news conference where he conceded victory on election day in Calgary, Alberta, Canada, on Monday, Oct. 19, 2015. Justin Trudeau's Liberal Party has swept into office with a surprise majority, ousting Prime Minister Stephen Harper and capping the biggest comeback election victory in Canadian history. Photographer: Ben Nelms/Bloomerg

Conservative Leader Stephen Harper, Canada's prime minister, attends a news conference where he conceded victory on election day in Calgary, Alberta, Canada, on Monday, Oct. 19, 2015. Justin Trudeau's Liberal Party has swept into office with a surprise majority, ousting Prime Minister Stephen Harper and capping the biggest comeback election victory in Canadian history. Photographer: Ben Nelms/Bloomerg