Same as it was before, negative polarization bringing reluctant anti-Trumpers home, double haters breaking for Biden and some positive economic developments in the third quarter.
I also think the price of Biden's age was one he was already paying...
...the perception outpaced the reality.
I am not saying sticking with Biden isn't risky. But I don't think his defeat is certain and I have no idea how to weigh the risks of changing candidates at this juncture.
I’ve long been convinced Biden was our best bet for this reason. But, if he can’t be trusted to speak in public without a teleprompter, I think that really limits the likelihood that he can accomplish 1 and 2. Also, the price of his age has increased measurably.