Death of Aleppo is no small issue and Gary Johnson gaffe reaffirms that candidates must be quizzed on policy

Libertarian presidential nominee Gary Johnson has doggedly sought the spotlight in his long-shot presidential bid, but on Thursday he got an unwelcome jolt of notoriety when he blanked on the name of Aleppo, a city at the heart of the protracted and bloody war in Syria. The gaffe, which was instantly and widely mocked, threatened to…