When the 17th Amendment destroyed vertical separation of powers, when the states left the senate, ALL power fell into the laps of one president, 535 congressmen/senators, and nine black-robes.
Our Framers were realists and knew exactly what would happen. It did. The wonder is that it took 101 years for an authoritarian like Obama to emerge.
The leftists will have a lot of power at a convention of states or a Con-Con