whenever extremists emerge as serious electoral contenders, mainstream parties must forge a united front to defeat them. To quote Linz, they must be willing to “join with opponents ideologically distant but committed to the survival of the democratic political order.” In normal circumstances, this is almost unimaginable. Picture Senator Edward Kennedy and other liberal Democrats campaigning for Ronald Reagan, or the British Labour Party and their trade union allies endorsing Margaret Thatcher. Each party’s followers would be infuriated at this seeming betrayal of principles. But in
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