A tug of war, a balancing act, two dancers dragging each other across the floor. This is the perpetual ebb and flow of power between the states and the federal government. How can things be legal in a state but illegal nationally? Are states obstinate barricades to federal legislation? Or are they laboratories of democracy?

Today's episode features Lisa Manheim, Associate Professor of Law at the University of Washington School of Law and co-author of The Limits of Presidential Power, and Dave Robertson, Chair of the Political Science department at the University of Missouri St.Louis.

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