But you don't understand what moderate voters are. Moderate are socially conservative Christian whites who are barely okay with gays getting married. Trans? That's out. So too is abortion, kneeling for the anthem, equal pay(women are housewives) climate change, universal health care, minimum wage, free college.
Moderate is giving up everything Bernie stands for, giving up everything you, Sealune, I, my cat and dog and more than most of this site stand for, and regressing back to about 2001 socially/culturally with a few modern allowances. Always remember in a election where its 18-dead can vote, moderate is 20 years behind you. The moderates aren't in New York or California, they're in rural Missouri, Arkansas, Wyoming and rural Washington state. They're the simple folk who need a 2 hour long Keven Bacon musical to come to the liberal choice, but Biden ain't about to tell them to let their hearts sing.
Moderates are Hobbits. Elves are conservatives. Men are liberals. And you need a wize old man who has spent his entire life trying to make the world a better place, say Berniedalf, to give them a little nudge out of the door. Biden in a LOTR analogy is Théoden under Saruman's control. But now without the liberal peace wizard to save him.
My point being that Biden is far more conservative than even Moderates are. So Biden is less a middle ground and more an acknowledgement that conservatives outplayed us.