Alongside President Johnson's Great Society and War on Poverty programs, Muskie drafted the Model Cities Bill which eventually passed both houses of Congress in 1966. Previously, combative with Johnson, Muskie began developing a more cooperative relationship with him. During Johnson's signing of the Intergovernmental Cooperation Act he said: I am pleased that Senator Muskie could be with us this afternoon. I believe that no man has done more to encourage cooperation among the National Government, the States, and the cities." Also in 1966, Muskie was elected assistant Democratic whip and served as the floor manager for the Clean Water Restoration Act.