In 2008, before the financial crisis and the subsequent “Great Recession,” the average real GDP of Democratic ($35.7 billion) and Republican ($33.3 billion) Congressional districts stood pretty close together. Now, almost two thirds (63.6 percent) of the country’s GDP is produced in Congressional districts that vote Democratic; a little over one-third (36.4 percent) of the country’s GDP is produced in Congressional districts that vote Republican. The average real GDP of Democratic Congressional districts has risen to $49.0 billion, while Republican districts have actually fallen slightly to $32.6 billion. That is, Democratic districts enjoy an average GDP that is fifty percent higher than Republican districts. This is reflected in median household income. In 2008, the median household income in Republican and Democratic Congressional districts was $53,000. By 2017, the median household income in Republican districts had declined to $51,500, while in Democratic districts it had risen to $62,000.
Whether one looks at finance and insurance or at the professions or at the digital industries, Democratic districts represent about two-thirds (64.3-71.1 percent) of jobs. Whether one looks at basic manufacturing or primary products, Republican districts represent more than half (56.4-60.5 percent) of the jobs.
Other measures mirror this economic divide. In 2008, the median percent of adults with a BA or higher stood at 25 percent in Republican districts and 27 percent in Democratic districts. By 2017, the medians had moved farther apart to 27 percent in Republican districts compared to 35 percent in Democratic districts. In terms of location, in 2008 the median population density in Republican districts was 350 people per square mile, while the median population density in Democratic districts was 850 people per square mile. By 2018, the rates stood at 200 people per square mile in Republican districts and 2,500 people per square mile in Democratic districts.
In the presidential election campaign of 2020, Joe Biden pulled in $486 million in campaign donations from ZIP codes where the median income was at least $100,000, while Donald Trump raised $167 million. Indeed, from households earning $75,000 a year to $150,000 a year, Biden out-raised Trump by $600 million to $300 million. In contrast, Trump outraised Biden in ZIP codes below the 2019 national median income by $53.4 million. Among those earning up to $75,000 a year, Trump out-raised Biden by about $400 million to about $340 million.
In ZIP codes where at least 65 percent of people had a BA or higher, Biden out-raised Trump $478 million to $104 million. From among the ZIP codes were 40 percent or fewer of people had BA degrees, Trump out-raised Biden by about $400 million to about $350 million.
It looks like the Democrats are becoming the party of rich, educated people telling poor people what they need, while the Republicans are becoming the party of faux common men giving poor people what they want. “Good and hard,” to quote Menken.
 Aaron Zitner and Dante Chini, “America’s Political Polarization Is Almost Complete,” WSJ, 20 September 2020.
 Basically moving around big pools of other people’s money.
 Medicine, law, higher education, and scientific research.
 Shane Goldmacher, Ella Koeze, and Rachel Shorey, “Map of Donors Reveals a Split On Class Lines,” NYT, 26 October 2020.
 In 2019, median household income was $68,703.