BAGHDAD, Iraq - Followers of the militant Shiite cleric Muqtada al-Sadr took over state-run television Saturday to denounce the Iraqi government, label Sunnis "terrorists" and issue what appeared to many viewers as a call to arms. The two-hour broadcast from a community gathering in the heart of the Shiite militia stronghold of Sadr City included three members of al-Sadr's parliamentary bloc, who took questions from outraged residents demanding revenge for a series of car bombings that killed some 200 people Thursday. With Iraqi Prime Minister Nouri al-Maliki relegated to the sidelines, brazen Sunni-Shiite attacks continue unchecked despite a 24-hour curfew...