That'll secure the nomination for Biden, I suspect.
I might be off in my reckoning, but I think what most average Democratic voters want for the next 4 years isn't a protracted fight about gun rights, or healthcare, or abortion, or any of the typical 'lefty issues'; it's simply to steady the ship and have an end to the absolute insanity of the current President and the new type of politics.
Under Trump the established government social rules have been changed. Openly lying is OK. Corruption, racism, bigotry and vice are acceptable. Communication in 128 characters of less is the appropriate channel from the ultimate authority. Loyalty to the CIC is more important than honesty and integrity to the country...
I think voters are uncomfortable with this change to their understanding of what 'politics' was and how the game was played, so it wouldn't surprise me to see them vote for the old establishment for this election, just to get back to a set of rules they understand. Bernie is almost too far in the opposite direction generally, and a female VP would be another 'change' to the old and comfortably understood rules.
When your car is on fire and pissing gas everywhere, it's probably the wrong time to start thinking about improving engine efficiency and installing eco-friendly seat covers, is all I'm saying.