John Dunn is professor of political theory at the University of Cambridge. His books include Setting the People Free: The Story of Democracy ( Atlantic Books, 2005 )

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The very potency of democracy as word and idea creates an impulse to extend it beyond plausible limits, and this is at the root of the flaws in Anthony Barnett & Isabel Hilton’s article. John Dunn, professor of political theory at the University of Cambridge, continues openDemocracy’s debate.