https://www.washingtonpost.com/politics/2021/04/14/trump-didnt-bring-white-working-class-voters-republican-party-data-suggest-he-kept-them-away/This article has two graphics as well:
So I think two things about this and that is :
1. Exit Poll data could be unreliable in things such as this
2. While Trump didnt make gains nationally with White Working Class voters he certainly did in the Midwest while Mitt Romney for example were much more concentrated in the South and West where he may have even done better with those voters than Trump did but failed in the Midwest. There is even an article from 2012 that points this out
https://www.theatlantic.com/politics/archive/2012/11/obamas-support-in-rust-belt-sun-belt-very-different/429300/In Rustbelt battlegrounds with smaller minority populations, like Iowa, Wisconsin, and above all Ohio, Obama is clinging to a narrow advantage behind strong support from those same upscale white women-and a better performance among working-class whites, especially women, than anywhere else in the country.
In essence, in the Sunbelt, Obama is relying on the new Democratic coalition of minorities, young people and upscale whites, while in the Rustbelt he is depending on support that much more closely resembles the traditional New Deal coalition that Democrats mobilized from the 1930s to the 1960s.
