 She says it was, in fact, as consequential as any presidential debate in history and the worst night for an incumbent in history. It was a total and unmitigated disaster for Mr. Biden. It was a route for Mr. Trump. It wasn't the kind of route that says if the election were held tomorrow, Donald Trump would win. It was the kind of route that says if the election were held tomorrow, Donald Trump would win a landslide. It is impossible to believe that the Democrats will continue with Mr. Biden as the presidential standard bearer.