With one big difference, the Democratic Party, since the day Donald Trump won the 2016 election, has looked like the killer android at the end of “The Terminator.”

Its flesh burned off, the Terminator’s endoskeleton continues to pursue Sarah and Kyle into a labyrinthine factory. A bomb blows off the Terminator’s legs, but the android still won’t stop. It drags the top half of its body across the floor and with its dying hand tries to crush Sarah, until a hydraulic press finally puts out the last blinking red light in its...