TORONTO -- With less than a week until election day, former U.S. president Barack Obama has waded into the fray to bolster the campaign of Liberal Leader Justin Trudeau, who he describes as his "friend." On Thursday afternoon, the popular former politician shared a tweet in which he appeared to reveal who he thinks should be Canada’s next prime minister. “Wishing my friend @JustinTrudeau the best in Canada’s upcoming election. Justin has been an effective leader and strong voice for democratic values, and I’m proud of the work we did together,”