In Egypt, Tahrir Square awash again in revolutionary fervor

A battle over a new constitution has mobilized Egyptian opposition to President Mohamed Morsi in Cairo. For the disparate groups, momentum and unity are key.

CAIRO — Knots of men argue politics, barefoot boys grip stones, graffiti blooms, banners unfurl and wind whistles through the tents of protesters in the latest stage of a revolution that, at least for now, has revived passions and lighted new campfires in Tahrir Square.

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