In evaluating the success of the American constitutional system, constitutional theorists often focus their attention on the broad structures through which constitutional law is made--for example, the existence of multi-member courts a majority of whose members usually must agree on the text of a single opinion or the difference in training and life experiences that judges have in comparison with legislators. The same theorists tend to pay little attention to a related set of institutional arrangements that are more recent in their development--for example, the proliferation of amicus briefs filed by advocacy groups, the substantial increase in the use of law clerks, or the degree to which public awareness of the content of Supreme Court op...