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.
Bernie attempted to take over the Dem Party and destroy the donor influence in the party. Remaking the DNC would bring enormous change. I think it was worth the effort, but I just wish he had fully plunged the knife into the party instead of being consumed by it. The more people who realize electoralism is a dead end the better.