The Democratic Party is rapidly becoming the Party of the professional-managerial class.

In 1980, the Democrats only won 9/100 of the highest income counties. In 2020, Biden won over fifty percent (57/43) of the highest income counties. Part of this, of course, was due to Trump's unique character flaws, but it is also part of a long-term Party reversal.

A key take home: Culture matters. Voters are not income maximizers simply punching the ballot for the candidate who is most likely to improve their post-tax net worth. Rather, they are voting for candidates & coalitions with whom they share broad cultural affinities.