The power of pressure groups tends to evaporate when it is translated into other dimensions of politics because the calculus of party politics is entirely different from the calculus of pressure politics. Numbers are everything in one dimension and very little in the other. We are dealing with two different strategies of politics and two different concepts of political organization. Moreover, the end product of party politics is inevitably different from that of pressure politics. Inevitably some people prefer one game to the other.
''the semisovereign people'' (1960)