They've strayed from their course, which was for the working class people. Now Trump is for the working class people.
The Democrats insist they haven't abandoned the working class although it seems much of what they try and do either alienates the working class or prices them out of everything in sight.
Generally it seems the working class have more pressing concerns than worrying about pronouns, and the relentless push to electrify everything prices out those who can't afford electric everything. Then the constant increases in the price of electricity helps price out the ones who struggled to buy into the idea in the first place.
Maybe the economy is doing really well if you have a brokerage account and a retirement fund. If you're struggling to put food on the table and keep the lights on the constant increase in the Dow merely reminds you how much money other people have. There's nothing like being told how great everything is when you're being left behind.
Whether Trump will do any better for the working classes remains to be seen but he seems a lot less condescending towards them.