GDR writes:
The point again is that I would argue that he was doing badly in the polls because many people saw him as being cognitively impaired.
Let's grant you that point.
Does this mean he is actually impaired? No.
Does this mean other Democrats deemed him to be impaired? No.
Therefore, it is wrong to claim that Democrats should have used the 25th Amendment to remove Biden from office because they had already deemed him to be unfit when they forced him off the ticket.
Politics is sales. One of the first things taught to me in my short sales career was "Perception is Reality". It doesn't matter how good your product is, if the product is perceived as being crap then the reality in sales is that it is crap, and you need to fix it. Biden was poorly perceived by the public, and he was getting his ass kicked, so they chose a new candidate. One wonders if the Democrats had changed the ticket sooner if the Republicans would have done the same. Trump was about the only viable person Biden could beat, and vice versa. If Nikki Haley were running on the Republican ticket I wouldn't be surprised if she wins.