WASHINGTON (AP) — Hillary Clinton’s presidential dreams were undermined by her use of a private email server that included classified information. Donald Trump has risked criminal charges by refusing to return top-secret records to the government after leaving the White House. And now misplaced files with classified markings could cause a political headache for President Joe Biden. The three situations are far from equivalent. But taken together, they represent a remarkable stretch in which document management has been a recurring source of controversy at the highest levels of American politics. For some, it’s a warning about clumsiness or hubris when...