Damn, that brings up a factor I've never thought of.
I wonder to what degree the Republican habit of pushing their most unapologetic conservatives to prominent positions has helped promote those positions, while the Democratic habit (at least since the 1990s) of marginalizing their most enthusiastic liberals has cast a wet blanket over public support for liberal ideas?
Like I said, psychological research shows that people tend to adopt the positions of those they stan. And Republicans have kept putting up extremist far-right politicians into power. Meanwhile Democrats keep putting mealy-mouthed centrists afraid to push strong positions into those same roles. Has that potentially resulted in less enthusiastic public support for liberal positions than otherwise would have been possible?
I've always thought the Democrats' failure to promote leftists has led to lack of enthusiasm among those who were already leftists and those who would benefit from leftist policies. But it might also have reduced the # of potential leftists full-stop and thus hurt the party doubly.
And people are surprised that the country has moved to the right
The GOP should have been dead after Bush's 2nd term. The best thing Bush/Cheney did for the Republican party was support Lieberman rather than the Republican in exchange for nuking the public option. Democrats since that loss have not really embraced big sweeping change.
They give Bernie and AOC some mic time to make people who identify with their beliefs feel like they have a say in the party then continue with business as usual and will never allow politicians like the aforementioned ever wield any actual power