A poster depicting Iran's supreme leader, Grand Ayatollah Ali Khamenei (right), and Ayatollah Mohammed Sadiq al-Sadr, late father of the radical anti-U.S. cleric Muqtada al-Sadr, towers over a Baghdad street on Sunday, Sept. 16, 2012. (AP Photo/Karim Kadim)

Photo by: Karim Kadim

A poster depicting Iran's supreme leader, Grand Ayatollah Ali Khamenei (right), and Ayatollah Mohammed Sadiq al-Sadr, late father of the radical anti-U.S. cleric Muqtada al-Sadr, towers over a Baghdad street on Sunday, Sept. 16, 2012. (AP Photo/Karim Kadim)