It's possible I'm a more moderate liberal than you are and I don't consider the left to be as monolithically radical as you do nor do I think they're chasing voters like me away.
I'd like to see the the Pew link if you've got it handy.
Edit. Saw your link above. Here's the exact quote from it:
"However, Democrats differ over whether the changes to ensure equal rights for all can be achieved by working within the current system, or whether most laws and institutions need to be completely rebuilt. Progressive Left and Outsider Left are far more likely than the two other Democratic groups to say systemic change is needed to combat racial bias."
I can'f find your exact quote within your quotation marks.
The systemic change is happening .. .. the re-writing of the rule- book underway .. can read my long post above on this .. but in short the move towards totalitarianism -- some form of totalitarian collectivist bliss--- is well underway .. done under the guise of these various Hot-button issues .. used as justification to trample individual liberty .. on the basis of "increased happiness for the collective" / Harm Reduction.
aka - I call it "The Plague" a fitting term for the Prog-Left. Not sure what percentage this would be .. but very high in my estimateion .. the number is easy to calculate if you know how many were against Biden's Vax Mandate .. then subtract from 100 .. My guess is that the number is above 80% on account of a very effective State Sponsored Propaganda Campaigne .. another Canary in the Totalitarian Coal mine.