BAGHDAD, Iraq - Beating their chests and calling for revenge, more than 300,000 Muslims began a two-day, 110-mile march to the holy city of Najaf on Sunday to mourn a cherished Shiite leader who was assassinated in a car bombing that killed at least 85 people. The faithful followed a flatbed truck carrying a symbolic coffin for Ayatollah Mohammed Baqir al-Hakim, a moderate cleric and Saddam Hussein (news - web sites) opponent. Authorities said they could only find al-Hakim's hand, watch, wedding band and pen in the wreckage. "Our revenge will be severe on the killers," read one of the...