We used to have the Unions and lots of White working class men. Now they are overwhelmingly Trumpers. And we are losing men of color. The shift of Hispanics has been enormous and probably was the difference in this election. Disappointingly, we lost White women. So much for RoevWade making a difference. It's the economy, stupid.
The growing income gap, inflation, weakened unions, and RW media designed to dupe low educated voters is the problem. Dems have been moving to the middle white the Right moves right. We no longer address the needs of the working class because we are busy compromiszing, and the Right which never cared about workers just lies and sells them causes like abortion and trans to get them to vote against their economic interests so they don't have to actually solve problems to get votes.
We also have stopped having Democratic Congresses that were the norm for decades after FDR, even through Nixon and Reagan. Republicans have stopped compromising as Dems did with Republican presidents. So we are no longer able to get things through, like the much more comprehensive health care plan that Carter proposed (and in that case, Ted Kennedy helped tank). There was so much in Biden's proposed bills that got lost because of Manchin/Synema refusing to end the filibuster that would have helped people economically. Not that we would have been given credit by the media, but like SS and Obamacare, some things would have been in place that people would have become attached to.
The people are for what we are for, if we could only implement it. And we need to go further: single payer for example. we are still subsidizing the Insurance Industry in the name of moderation.
All this a moot point now. What we should have done. Now all we can hope is that it will all crash badly enough to get us out of this mess, and that there will be a way to recover.