POLITICO's top headline explicitly points out that congressional Dems are more inclined to oppose Biden than governors because they're afraid Biden will drag them down with him. I suspect that's where the weak poll numbers is hurting him most
They're feckless cowards that have to be dragged kicking & screaming to their responsibilities, & they are more than anyone else in the nation responsible for the collapse of American constitutional government, excepting their peers on the other side of the aisle