Cowardly, yes Donald Trump is not invincible in spite of MAGA mythology, explains Jamelle Bouie: In the folk wisdom of recent American politics, Donald Trump is a figure of herculean invulnerability to traditional scandal. What lands as a crippling blow to most politicians leaves nary a scratch on Trump, who effortlessly deflected the slings and arrows of the 2016 presidential campaign and paid no discernible price for the “Access Hollywood” tape, his racism or his general incoherence. There has long been a “please don’t hit me” reflex among established Democrats, a conditioned, abused-spouse behavior. Don’t make Daddy mad. Don’t impeach him. Don’t hold him accountable. You’ll just make him stronger. And madder. Bouie offers some examples. Now on trial in Manhattan, Trump is grinding his teeth to nubs over humiliating descriptions of his sexual encounter with Stormy Daniels, about the age of his daughter Ivanka. Yet the myth of his invulnerability is rising again, like the South. Even so: Let’s look at the situation as it stands. Despite his best efforts, Trump has not been able to summon the grass-roots activity that signals political strength. There are no febrile crowds demanding justice for Trump at the courthouse door, no mob poised to wreak havoc in Trump’s name — not that he didn’t try to make one appear. And the broader public does not appear to have a problem with either the trial or the prospect of jail time for the former president. A majority of Americans — 54 percent in the latest…