Alexander and Horton have attempted to untangle one of the most difficult and potentially far-reaching questions in constitutional law: at what point does constitutional law leave off and plain old law' remain to occupy the US legal system's field of play? In addressing this question the authors take on two of the most murky concepts in constitutional law, state action; and under color of law.' In their attempt to make sense of these notions they develop models that potentially could provide coherent, principled answers to the problems created by the Supreme Court in its decisions in this...