From 1840 to 1960 the profoundest claim of Americans who fought the institution of segregation was that the government had no business sorting citizens by the color of their skin. During these years the moral and political attractiveness of the antidiscrimination principle made it the ultimate legal objective of the American civil rights movement. Yet, in the contemporary debate over the politics and constitutional law of race, the vital theme of antidiscrimination has been largely suppressed. Thus a strong line of argument laying down one theoretical basis for the constitutional...