Don’t forget the government deadhead class - teacher’s unions, courthouse crowd, postal employees. They are usually reliable Dem voting groups.
Be sure to make a distinction between the teachers’ union leadership and paid staff and the rank-and-file membership.
The leadership and paid staff, yes vote Rat 95% of the time (as reliable as the black vote). But the non-office holding member, I am sure not that high of a percentage
> postal employees
I know some postal employees in the high levels of the union and they are very strongly anti-Democrat. The democrats have lost them, too.