Alan Singer of Hofstra University imagines a coup d’etat in the United States. Is it possible that one man with a talent for demagoguery could capture one of the major parties, could win the election with extreme and divisive promises, could appoint people who were determined to destroy the agencies they lead? No, it can’t happen here, right? By the by, Trump named alt-right leader Steve Bannon to sit as a regular member of the National Security Council.