Sen. Joseph McCarthy liked to insist he had evidence of Communists in the government, but he couldn’t show you the names right now. The number of Communist infiltrators on his secret list changed from speech to speech. Listening to President Trump’s legal team claim over and over again that they have voluminous evidence that the election was stolen, it occurred to me that we’re in a kind of repeat McCarthy era. Only this time, to borrow from that old-school Communist Karl Marx, history is repeating itself not as tragedy but as farce. Take Sidney Powell, a former federal prosecutor who...