US Elections question: Bernie Sanders said that the Democrats abandoned the working class, and the working class abandoned them. How is this true? - eviltoast

Asking as someone from the other side of the planet.

From the things I saw about the US election, the Dems were the side with plans for the economy - minimum wage adjustments, unions, taxing the rich, etc. The Republicans didn’t seem to have any concrete plans. At least, this is what I saw.

I don’t doubt Bernie Sanders though - he seems like a straight truth teller. But what am I missing?