In private most Dems will tell you that they wish they could replace Biden. In public, they need to gaslight everyone into believing that the obvious signs of mental and physical decline aren't too bad and he's ready to go for another 4 years. When the truth is he won't last another year and Harris will become President not long after the inauguration. Something no one, not even Dems, want to see, but they'll go along with it because it's not a cult.