Angry insurgents rarely prosper in British politics. Two big things help explain this: voting rules and sniggering. Britain's first-past-the-post voting system is rather brutal to small parties. And if electoral rules do not snare a would-be demagogue then mocking laughter probably will. It is a brave politician who stands before British voters, face red and voice shaking with fury. There is always the risk that at some climactic moment a heckler will interrupt, posing a variant on the ancient British question: just who do you think you are?
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