> Is there evidence that left wingers tend to be more as affluent than right wingers? Genuinely asking.
Yes, just read the articles about the Democrats losing the working class. There's lot of evidence and analysis in them on your very question.
IIRC, the Democrats have been tuning more and more into educated, affluent people, and those people have been tuning into liberal positions on culture war issues. These are the people who inhabit the influential positions of the party, and they set the agenda to resonate with themselves (e.g. student loan forgiveness). That caused them to lose sight of the traditional working class, and thus shed working class support.