The founder of the idea of "checks and balances" themselves (Montesquieu, Secondat) said it, the Founding Fathers who were influenced by the two (Madison) wanted to charter it (Federalist n. 10), and Hobbes argued for it in Leviathan. The writing has been on the wall for CENTURIES to include The People as its own entity within the ontological power-struggle of American politics - we were just led to forget our own history.