The political journalist Mark Halperin, co-author of the best-selling book “Game Change,” reported on his webcast on Friday afternoon that top Democrats in the party, in the White House and on Capitol Hill believe that President Biden will have no choice but to step aside in the next few days, saying that the president’s wife and son, Jill and Hunter Biden, still want to fight, but that the family “will not stop the inexorable from happening.”