I see no reason for that assumption. All around us, that assumption is roundly obliterated every day...
I have lived on the west coast my entire life. I have seen it change from Scoop Jackson and blue collar Democrat, to an insanity that puts Omar and AOC squarely in the mainstream...the mainstream of not only Democrat thinking but the mainstream of the population at large.
I think we may well be whistling past the graveyard thinking that the voters reject these ideas. In a huge swath of the nation, these ideas are ARE the mainstream. And that swath is growing not shrinking. They are on the offensive.