I am, somewhat notoriously, not in favor of straight "majority rules" democracy and not in favor of absolute, universal, unfettered suffrage. In a recent op-ed on Egypt's coup, George Will has an apt quote that sums up my distaste for pure democracy.
Lincoln understood that unless majority rule is circumscribed by the superior claims of natural rights, majority rule is merely the doctrine of “might makes right” adapted to the age of mass participation in politics. The idea that the strong have a right to unfettered rule if their strength is numerical is just the barbarism of “might makes right” prettified by initial adherence to democratic forms.
I think that the U.S. Constitution should be far more of a straight jacket than it currently is. It would be limiting and frustrating, even to some of my own policy goals. But that's as it should be. Tyranny is the inevitable result of letting the majority rule simply by virtue of being the majority.