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The chaos at the second anniversary of the Tahrir Square uprising is only the latest and most vivid illustration that the Egyptian revolution is going off the rails. It has revived talk about the failure of the Arab Spring and even some nostalgia for the old order. But Arab dictators such as Hosni Mubarak could not have held onto power without even greater troubles; look at Syria. Events in the Middle East the past two years underscore that constitutions are as vital as elections and that good leadership is crucial in these transitions.