Reflections on Opposition in Western Democracies

To one who believes in the essential worth of a democratic polity, how much opposition is desirable, and what kinds? What is the best balance between consensus and dissent ? Even among democrats there is not much agreement on the answers to these questions. It is easy to see why. These questions seem to demand nothing less than a complicated assessment of democracy itself. Or to put the matter more precisely, one can judge the desirability of different patterns of political opposition only by employing a number of different criteria that would be used if one were appraising the extent to which a political system as a whole achieves what are usually considered democratic goals or values.