Donald Trump is Biff Tannen. Biff is running for president, and he’s leading in the polls. You know Biff—the churlish brute from “Back to the Future” whose best known lines are “Hello? Hello? Anybody home? Think, McFly!” and “Hey butthead!” Regardless of what you think about Trump’s politics, the man is a unique personality that cuts through American culture like a chainsaw—rough, noisy, and with lots of flying pieces. Lest you dismiss him, Trump also has some incredible assets that propelled him to the top of the polls: name recognition, money, cojones, and most importantly, a seething cynicism and distrust...