I'm not sure any data regarding Biden specifically is worth much in terms of future assessment because such a huge amount of it would be tied to Obama's enduring massive popularity amongst all democrat demographics along with being the nostalgic "return to normal" option. There really isn't anywhere to go with that beyond Biden (unless they convince Michelle Obama to run?). Iirc a substantial number of Biden voters had Sanders as their 2nd preference too?
The new options they presented flopped pretty badly. It's hard to look at Harris on the basis of her performance in the 2020 primary as being an especially strong frontrunner but it's even harder to think up of any alternatives who will be in strong enough of a position to displace her.
The new options they presented flopped pretty badly. It's hard to look at Harris on the basis of her performance in the 2020 primary as being an especially strong frontrunner but it's even harder to think up of any alternatives who will be in strong enough of a position to displace her.