Pew Research (2024) says: About six-in-ten voters with lower family incomes (58%) associate with the Democratic Party, compared with 36% who affiliate with the Republican Party.

You should check the exit polls from 2024 if you want to go back that far then.

Republicans won the vote for the under $100k bracket.

Both can be true. Democrats tend to dominate the lowest income quintile, while Republicans tend to win the second and third quintiles. So if you're only looking at the bottom quintile, Democrats would win that cohort. If you combine the bottom three quintiles, Republicans would win it.

That doesn’t make sense either. Democrats won the popular vote of the $100k+ crowd in 2024.

And of course if can be both, I said this in a separate response that this isn’t a black and white conversation, which is why I responded to begin with to the responder.