Michael Ignatieff is used to being admired in his native Canada, not to mention envied. His genre-leaping successes as a writer and broadcaster — reporting from hot spots in books and documentaries, defining the legacy of a major 20th-century political theorist in his biography of Isaiah Berlin, and even making the Booker Prize short list for his novel Scar Tissue — rank him among the most influential Canadian thinkers. And it doesn’t hurt that, at 56, the former BBC talk-show host retains his made-for-TV looks and effortless eloquence. But these days Ignatieff is coming in for as much criticism as adulation on forays back to Canada from his day job as a human-rights professor at Harvard University. The issue that has driven a wedge between him and many of his Canadian fans: Ignatieff was arguably the most prominent liberal supporter of the U.S. invasion of Iraq. Continue…