A supporter of Shi'ite cleric Moqtada al-Sadr flashes a victory sign as he wears the Iraqi national flag during a demonstration in Najaf April 9, 2010. Anti-U.S. cleric Moqtada al-Sadr, a key player in forming a new Iraq government, urged Sunni and Shi'ite Muslims on Friday to unite to oust American troops. REUTERS/Thaier Al-Sudani (IRAQ - Tags: POLITICS CIVIL UNREST RELIGION)