Well I suppose Miami-Dade is hard to see, but the RGV really highlighted the Democrats *even worse* performance among rural-working class voters of all races. The RGV is just the next tale in the story of the modern Democratic struggle to receive the working-class vote. Democrats mustn't lose any further ground in working-class America, or Pennsylvania might be gone.
Pennsylvania is hardly the bastion of working class America. It's economy is quite white collar. Philadelphia and its Dem-friendly suburbs are growing (albeit slowly), as well as the Allentown area too. The Pittsburgh area is no longer seeing steep losses either. Maybe Michigan fits the profile of a working class state better.