agreed with a few points of consolation.
First, he and the dems seem to have learnt from 2016 that not being Trump isn't enough by itself to win. They need to inspire people to vote for them, and give them positive reasons to do so. Consequently, he seems to have allowed Sanders a fair degree of input and influence into the platform, and consequently this looks like the most progressive platform any democrat has stood on since Mondale in '84 (OK, the bar's low, but...). It's woolly, but still a street ahead of anything offered since then.
Second, there is currently a progressive surge in American politics - both in legislatures and executives, and at street level. The fastest growing politcal movements of the past couple years have been BLM, the DSA, the Justice Democrats and the Sunrise Movement. They - and other genuinely progressive movements - are attracting unprecedented support from people under 40, and I think biden knows he will need their support, and to repay them for it.
One way and another, there's more leverage to hold a Democrat president's feet to the fire, and more momentum to do so, than for a very long time indeed.
Third, if they win the Presidency and both Houses (a fair chance) they know they will have that very short window of opportunity to fully exploit that. The last time this happened was in 2008, when Biden was the successful VP candidate, They made a huge mistake, as most Democrats now acknowldege, of being too cautious, moderate, piecemeal and conciliatory. Result? their programme got stillborn, Obama's Presidency was badly damaged, and the republicans won back the Senate 2 years later. They have every incentive to go shit or bust, and ram through as much legislation - and exec orders - early doors. Assuming Biden wins, here'll be a 1 term president (no way he'll last the full distance). He, like all politicians, is obsessed with his legacy. He needs to move fast, to have one that won't make him the nation's laughing stock.