The bombing and bloodshed that pushed Iraq to the brink of civil war have propelled anti-American firebrand Muqtada al-Sadr to the forefront of Iraqi politics. The young Shiite cleric who twice defied America in 2004 now has emerged as a major threat to U.S. plans for Iraq.Al-Sadr had already managed to carve out a strong position in Iraqi politics. His followers won 30 of the 275 parliament seats in the December elections, and his support enabled Prime Minister Ibrahim al-Jaafari to win the nomination of the Shiite bloc for a second term as prime minister. But the outbreak of Shiite-Sunni violence presented al-Sadr with an opportunity that he was quick the exploit.
Through skillful use of intimidation, first, and then concessions, al-Sadr, 31, has profited more than any other Iraqi figure from the unrest that swept the country after the Wednesday bombing of a Shiite shrine, which triggered reprisal attacks against Sunni mosques and clerics. Many of those reprisal attacks were believed to be the work of al-Sadr's own Mahdi Army militia, which operates in the Shiite slum of Sadr City and in Shiite strongholds throughout the country. But al-Sadr, who was in Lebanon when the bombing occurred, denied any role in the violence. He quickly joined moderate Shiite clerics in public appeals to halt the attacks.