It's the fact that as much as Democrats may not like Biden, they are even less likely to like someone that would replace him; case in point, nearly every Democrat tried in 2020 and they all still lost, pretty miserably in most cases. 
Plus, from a purely strategical and political perspective, it would be downright idiotic to replace a sitting president in the primary. You would lose the advantage of being an incumbent president and yet your general election opponent would still tie you to every single thing that was done under their administration. They'd be going into the general with one arm tied behind their back. And that's not even bringing up the inevitable bad taste left in at least some Democrats' minds by daring to challenge a sitting president in the primary.
Edit history
Recommendations
0 members have recommended this reply (displayed in chronological order):
= new reply since forum marked as read