NEVER take anything published by McClatchy Newspapers at face value. NEVER..
One of the few things that could really derail the Baghdad security plan (and helped greatly to derail last years Baghdad security plan) was a strong Madhi Army attack during the summer on the Sunnis, which would get them to stop fighting al-Qaeda.
Iran would love to see just such an attack happen and just might order up such an attack. The US military is I am sure watching out like hawks for this.