Sign up for the Slatest to get the most insightful analysis, criticism, and advice out there, delivered to your inbox daily. There has never been a moment in the history of the modern Democratic Party when brandishing a Nazi tattoo, even one that has been hastily covered up, wouldn’t immediately torpedo a candidate’s electoral prospects. This is the information that made me conclude that Graham Platner, the oyster farmer turned politician gunning for Maine’s Senate seat, would not succeed in his race after news broke last October that he had a Totenkopf—a skull-and-crossbones symbol closely associated with the SS—emblazoned on...