"It has long been presumed that the diversity of constitutional forms makes for an optimal result. In reality, it creates a system of impediments that makes popular reform nearly impossible. As with Polybius and Cicero, so with Aristotle, and so with the framers of the United States Constitution in 1787 . . .--all have been mindful of the leveling threats of democratic forces and the need for a constitutional "mix" that allows only limited participation by the , with a dominant role allotted to an elite executive power. . . . Diluting democratic power with a preponderantly undemocratic mix does not create an admirable "balance" and "stability." In actual practice, the diversity of form more often has been a subterfuge, allowing an appearance of popular participation in order to lend legitimacy to oligarchic dominance."