The United States constitution was a highly controversial subject in that some people thought it would give the federal government too much power,while others thought it would give it too little.The compromise was about how much power to leave the individual states.
You're right! Plato C. thought philosopher-kings should run the government.
In Plato's Republic, Plato argues that the ideal rule is by a philosopher-king who has stepped outside the cave, seen the light and come back to with this understanding to the cave to rule (see Cave metaphor).