The conceptual Bulgarian-born artist Christo died over five years ago. It’s a shame, because the Democratic Party and the American left need him again. Christo, for those of you who aren’t into his “art,” was into wrapping stuff up. Not just like Christmas presents, although his work could be dismissed as such. No, he liked covering up stuff like the Arc de Triomphe in Paris, the Reichstag building in Berlin, and the gates in Central Park, New York. His work, ladies and gentlemen: Christo and his collaborator, Jeanne-Claude, may have been hacks of the highest order, but when it comes...