Seven years ago, Democratic Maine Senate candidate Graham Platner cruelly mocked an American soldier who was caught on camera taking fire from the Taliban in Afghanistan. The viral helmet footage showed how Pfc. Ted Daniels moved into the open as a diversion tactic to help his squad mates get to safety. But Platner saw him as a “dumb motherf—er” who “didn’t deserve to live.” “This video never gets old. Dumb mother—er didn’t deserve to live. At least his stupidity and fat ass wheezing are available for all future infantrymen to witness and hold in contempt,” Platner, then a 34-year-old, chided...