Obama and members of his administration have been running the government using Biden as their puppet. They were perfectly happy with that arrangement until Biden's debate performance with Trump where it became crystal clear to everyone that Biden was not up to the job. They couldn't hide it anymore, though they would have if not for that.

Obama wanted to have an open primary to replace Biden on the ticket, but after being forced out of running for President by Obama and Pelosi, he vindictively endorsed Kamala to replace him as the candidate. He knew she couldn't win and so did Obama and Pelosi. They wanted someone else but after Biden endorsed her they had to suck it up and accept her.

Obama still maintains his residence in DC, just so he can stay on top of things, but after the landslide election of Trump, he knows its over. When he was on the campaign trail trying to stump for Kamala, it was clear he lost his mojo. He couldn't convince "the brothers" to vote for her. Black people woke up in the last election to the lies of the Democrat party. Obama is hoping now he won't be held accountable for what he did to Trump so he's laying low.