This is exit poll data for Minnesota. I chose Minnesota because of it being a roughly white state that swinged a lot to the right.
In 2012 the poor overwhelmingly favoured Obama while the richer voted Romney
In 2016, the poor were tied, the middle class voted for Trump, and the richer saved Clinton's ass by voting for her. The same people that favoured Romney. That swing of the richer class didn't made up for the swing for the poorer to Trump but it's evidence of Obama - Trump voters being poorer and lower educated in general while Romney - Clinton voters are better educated and generally richer. That saved Minnesota for Clinton, while if the rich voted like in 2012 Minnesota would have gone to Trump by like 5.
Turn-out numbers also indicate that a lot of the poor stayed home in 2016 because turn-out decreased and is up with the rich relatively.
MN has some more weird exit poll data, like the 18 to 24 year olds voting for Trump. It wouldn't surprise me if they did it again in 2020, since Biden is technically an even worse fit for the youth than Hillary Clinton, although I doubt some would vote for Trump again after his false promises. He isn't exactly a president for the youth. Bernie is someone who would drive youths en masse to the polls and flip them back easily with his campaign like cancelling study debt.
Some of these "newer" voters definitely have an influence on the "income" exit polls data, as students are generally poorer than older aged voters.
Obama won that group with +34. Trump won them by +5, a 39 point swing. (not the same voters obviously, except for the 23 year olds and 24 year olds and some 22 year olds). And again also a sign that a lot of the Obama youth stayed at home, as turn-out is generally down (14 and 7 to 10 and 9).
