How do we know Stephen Harper was born in Toronto? Sure, there may be hospital records, and he probably has a birth certificate. But have any of us seen such proof? For all we know, he could have been born in the United States. He certainly seems well-steeped in American-style politics. The question may seem silly, since it doesn't matter much where he was born. But in the U.S., where the constitution explicitly states that only a "natural-born citizen" can become president, the question has provided fodder for spurious attacks on president-elect Barack Obama. Obama was born in Hawaii, where...