But here is a broader thematic reality for the president: Bad vibes have been the persistent feature of his campaign. No matter the obstacles Trump creates for himself, Biden remains a comprehensively weak incumbent, weighed down by the same liabilities that burdened him from the start, beginning with the largest, and completely unfixable, one: At 81, he is much too old to run for president. Durable supermajorities of voters still do not want any part of Biden at this age. His bullheaded insistence on doing something no one has ever done (Ronald Reagan, then the oldest president in American history, was 77 when he retired), along with the unwillingness or inability of Democrats to stop him, remains an existentially risky, potentially disastrous, proposition. The stakes remain appallingly high. If Biden loses in November, that’s all anyone will remember him for. ...

Like many people, I’ve made the unwelcome comparison between Biden and Supreme Court Justice Ruth Bader Ginsburg, the late liberal icon whose legacy was stained by her unwillingness to retire while Barack Obama was still president. Ginsburg’s death, at 87, occurred in the final months of the Trump administration, which allowed him to appoint her successor (Amy Coney Barrett). The Real Time host Bill Maher dubbed the octogenarian president “Ruth Bader Biden” on his HBO program last September. Biden, Maher said, was “the person who doesn’t know when to quit and so does great damage to their party and their country.”

Biden’s conduct is far worse than Ginsburg’s, in fact, given the awesome power of the presidency and the havoc Trump could unleash with it this time.