The United States makes large claims for itself, among them the claim that the nation is the model for a society based simultaneously on democracy and multiethnicity. It's certainly no exaggeration to say that on the success or failure of this principle much else depends. But there must be better ways of affirming it than by clinging to an insipid parody of a two-party system that counts as a virtue the ability to escape thorny questions and postpone larger ones.