Bernie Sanders loves organized labor; it’s his natural habitat. You can easily imagine him as a turn of the century labor organizer fighting to overcome racial and ethnic divisions and unite the working class against the predatory capitalists. He was just born a hundred years too late.
The problem for Bernie is that he is also committed to a hugely expensive climate change program that will cost hundreds of thousands of workers their relatively high wage jobs. As you can imagine, they aren’t too keen on that. The prospect of leaving a coal mining job and becoming a solar panel salesman making far less money doesn’t appeal, for some reason.
If Bernie were somehow elected president, this would be an excruciating decision. Fortunately for him, and us, it is one he will never face, barring a complete economic collapse between now and the primaries.