" Bismarck had cunningly taught the parties not to aim at national appeal but to represent interests. They remained class or sectional pressure-groups under the Republic. This was fatal, for it made the party system, and with it democratic parliamentarianism, seem a divisive rather than a unifying factor. Worse: it meant the parties never produced a leader who appealed beyond the narrow limits of his own following. "

― Paul Johnson , Modern Times: The World from the Twenties to the Nineties