What makes you think Obama would not kneecap him in 2016 if he had a real shot? What's stopping Obama from doing the same in 2016 the things he did in 2020? What do you think stopping Obama from actually endorsing Biden in 2020 or Hillary in 2016? Obama endorsement is the trump card, and there is no rule saying that ex-president can't endorse. The establishment didn't even use all their cards both in 2016 and 2020. This just shows how far away we really are from winning electorally.
What makes you think Obama would not kneecap him in 2016 if he had a real shot? What's stopping Obama from doing the same in 2016 the things he did in 2020? What do you think stopping Obama from actually endorsing Biden in 2020 or Hillary in 2016? Obama endorsement is the trump card, and there is no rule saying that ex-president can't endorse. The establishment didn't even use all their cards both in 2016 and 2020. This just shows how far away we really are from winning electorally.