My understanding is that they had identified the voters as working class based on their education, but class is obviously more than education. The people who voted for Trump had more money than Clinton voters, and this suggests perhaps two-income homes where both members have moderately waged jobs? There are help wanted signs everywhere, just everywhere around the Twin Cities, but at least on the surface they are all low-wage or part-time jobs. I don’t know how the job market is for better jobs here. Perhaps this is what gives people a bad impression? There is certainly a paucity of high wage blue collar jobs nowadays.
I am from the poverty class. Most of my siblings grew up to be working class. My brothers work as a lumber yard supervisor, electrician, and mechanic respectively. For two of them, things are always paycheck to paycheck. Those two are the ones who voted for Clinton. The one who is financially better off (he’s in a union), he voted for Trump. Go figure.