Graham Platner dropped out of the Maine Senate race amid serious sexual assault allegations and calls from his peers to quit. But leaders should not have needed another scandal to act. The Nazi tattoo should have been enough. And the failure to say so is not a Democratic problem or a Republican problem. It is an American one.Let’s be clear about what the Totenkopf is. German for “death’s head,” it is not a generic skull and crossbones. It is a symbol with a precise and horrific history, worn by the SS-Totenkopfverbände, the Nazi paramilitary units responsible for guarding and operating...