I remember being told my vote "wasn't needed" back in 2016 when you liberals lost to Trump the first time. You're an arrogant bunch who never learn from your mistakes because you'd rather blame leftists and play divide and conquer games. Which ironically makes you sound more like maga than leftists do.
Btw I did vote for Clinton (and Biden and Harris). But plenty of people aren't going to forget the way you liberals shit talk them and won't be as forgiving.
Liberals need every ounce of support they can get. It's crazy to me that despite the last ten years you'd still be dumb enough to tell people off and claim you don't need a coalition when you very, very obviously do.
Maybe try learning from actual leaders like Talarico who are able to appeal to all anti-fascists instead of being intentionally divisive.
Other than Nixon it was a much more gradual change. Even in the 90s you still had deep red states voting for Democrats every now and then, look at all the states Bill Clinton won.
It's only in the 21st century where the realignment finally settled and you can really see where the lines were drawn.