That's a pretty bold statement. Manchin is a politician. If they want him to sign on to the Green New Deal, they have to give him something big that he can give to West Virginians. Maybe the new FBI headquarters in the state?
West Virginians particularly the local & state government authorities discovered to their chagrin that having a large federal facility is a very mixed blessing. The large FBI facility in Clarksburg required an expensive upgrade of local infrastructure - water, sewage, gas, road net & electric power. Guess what!... fed facilities pay no local & state taxes !