Sen. Ted Cruz hadn’t been an official contender for the presidency of the United States for 12 hours before the questions started coming, even in the warm and welcoming cradle of a primetime interview before what should be the friendliest of conservative audiences. “You were born in Calgary, in Canada,” FOX News host Sean Hannity asked him, glancing into the camera for an apologetic chuckle. “Is there a birth certificate issue?” It’s a question that’s lurked around the edges of Cruz’s political profile ever since the junior senator gained enough notoriety to be mentioned as a presidential candidate. Google searches...