Fetterman immediately was endorsed by two large unions (steel workers and food service) representing 80000 Pennsylvanians. Within just two days of announcing his candidacy he has received 37000 small dollar donations from all 67 counties in Pennsylvania and all 50 states.
Fetterman was endorsed by Bernie Sanders in all of his election cycles and was one of the only people elected to high office in Pennsylvania to endorse Sanders for president in 2020.
Why abandon any vector of attack against the establishment?
social democracy is the establishment, it's a centrist position.
Then the Health insurance industry isn't part of the establishment.
Yes, it is. they are both part of the same system.