After attending a Donald Trump rally of steel workers in late July, a Chicago columnist wrote this. “I left the hall thinking: Donald Trump is going to be re-elected in 2020. The Democrats don’t have anyone who can touch him. Bank on it. Don’t hate me for being the one to tell you.” Of course he was right, but he was far more correct than he realized. While it is very true that the Democrats have no one who can touch Trump in 2020, they have no one who can touch Trump in 2018 either. The news that former President...