The good thing about Biden and Harris is that they're not ideologues. They reflect the times they're in and they'll respond to external forces. The fact is the left's ideas are winning right now, and they will reflect that.

See this thread I did https://twitter.com/cremnob/status/1264284604422389760

They're politicians in the truest sense. They're driven by personal ambition and if they see that it benefits their political careers to move left, that's what they're going to do. That's why all these primary challenges where leftists trounce the centrist shills are so important

Changing the ideological makeup of Congress by every House/Senate race is important, but it also sends a signal to the non-ideologues on which way the winds are blowing.

Why do all these boomer Democrats have Reagan Brain? It's because for a long time that was good politics. Now the circumstances have changed, and the good politicians will change with the times.