This article explores an attitude which I call perfect constitutionalism. Perfect constitutionalists believe that, properly interpreted, the Constitution requires that our society conform to the best principles of human governance. This belief that the Constitution is nearly flawless not only underlies the so-called fundamental values strand of constitutional thought but also those strands of constitutional argument based on conceptions of the democratic process or the original intentions of the framers. Unfortunately, empirical and theoretical problems result when constitutional theory is reduced to political philosophy. In order to overcome these problems we need to essay a different interpretive approach, one which I call imperfect constitutionalism. Imperfect constitutionalism emphasizes the value of constitutions, even ones that might be improved in many ways.