The editorial in the Times calling on President Biden to quit his campaign for a second term is really something — a study in journalistic desperation. Mr. Biden has just won a primary race that has put him in a position to be the Democratic Party’s nominee. Now, at the first whiff of a campaign debate, the Times wants him to quit. “The president’s performance in the debate,” it says, “made it clear that he is not the man he was four years ago.”