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Rally in Sadr City, Baghdad

Sadr supporters hold a banner with images of Muqtada Sadr's father, Grand Ayatollah Mohammed Sadiq al-Sadr, right, and his uncle, Mohammed Baqir al Sadr, during a memorial rally. At the height of the civil war, Muqtada Sadr's Mahdi Army militia was one of Iraq's most powerful groups; the U.S. military credits Sadr’s decision more than a year ago to call a cease-fire as one of the chief reasons for the sharp drop in violence in Iraq. Karim Kadim / Associated Press