OTTAWA -- Former U.S. president Barack Obama has waded into the Canadian election, offering an unusual cross-border endorsement of Liberal Leader Justin Trudeau with five days left in the campaign.“I was proud to work with Justin Trudeau as President. He's a hard-working, effective leader who takes on big issues like climate change. The world needs his progressive leadership now, and I hope our neighbors to the north support him for another term,†said Obama in a tweet sent Wednesday.SNIPMinutes after it was posted, a spokesperson for U.S. President Donald Trump’s 2020 reelection campaign called it “foreign election interference,â€Â but according to Elections Canada,...