I think what this shows is that there’s a perceived problem with the Democratic Party. Democratic Party policies are often popular on their own (see the numerous Medicaid referendums), but the party’s candidates aren’t. I’d assume that this comes from a lot of socially conservative and economically liberal voters who value social conservatism over economic liberalism.
I've read this is due to racism and "stick issues" like abortion or gun control that make Democratic Candidates toxic to right wing voters, even if they support general left wing policies like expanded medicaid.
