[W]hile American intelligence agencies have pointed to links between leaders of Al Qaeda in Mesopotamia and the top leadership of the broader Qaeda group, the militant group is in many respects an Iraqi phenomenon. They believe the membership of the group is overwhelmingly Iraqi. Its financing is derived largely indigenously from kidnappings and other criminal activities. And many of its most ardent foes are close at home, namely the Shiite militias and the Iranians who are deemed to support them.