Graham Platner’s victory this week in Maine’s Democratic Senate primary would have been a stunning achievement for a political newcomer under any circumstances. What makes it truly remarkable is that Platner pulled this off despite a decades-long trail of questionable behavior: a Nazi tattoo ; contemptible written statements about sexual-abuse victims, Black people, and women; admissions of past substance abuse and marital infidelity ; allegations of demeaning, disturbing, and physically