By triangulating the center (the Clinton way) taking for granted the like and the working class on the basis that "they have nowhere else to go" has found that it can less and less count on these groups to build a popular coalition. Abandoning populist economic policies while doubling down on culture war super ego scolding leaves them entirely weak and unable to accumulate popular support. Pair that with the fact that Republicans are generally better at cynical, byzantine legal maneuvers; the Republicans have a more coherent political narrative (however fictitious and ignorant); and Republican have an easier mandate to fulfill: prevent the public sector from functioning and "own the libs." Basically the New Democratic party as exemplified by Carter, Clinton, and Obama has been an utter failure at almost every level and is finally running aground. Now we're in the stage where it will either reform itself (because of confrontations by the electorate most likely) in time to save its own viability... or it will continue to lose until its inevitable restructuring. The speed of this, imo is generally based on the speed at which the terminal mass of liberal voters properly identifies the Democratic leadership and their political philosophy as the primary reason for the party's failure. That's my take at least.
---the late great Donald Blake
If I could thumbs up your post I would.