There are some other things transpiring in American politics right now. But we must note that Democratic leaders are now unabashedly stating what Bernie Sanders supporters said over and over in 2020: the party pushed Joe Biden primarily to stop Bernie.
He was the first president to join a picket line
https://www.bbc.com/news/live/world-us-canada-66917039
He didn’t join a picket line, union members were brought to him for his photo op.