David Petraeus had a classified documents case. So did Hillary Clinton. Now so does Donald Trump, who is being indicted by Special Counsel Jack Smith. And so does Joe Biden.All would be and actual presidential candidates and presidents, with varying degrees of popularity, but all were humbled or are being humbled by the prospect and fact of U.S. Justice Department investigations over their handling of classified documents during and after their times in office.Despite the publicness of these cases, they were not result of a groundswell of public sentiment against these public figures and candidates — Trump supporters popularized the ...