Ray Takeyh had a great op-ed last week that I'm just now seeing:

In the past week, a parade of Bush administration officials have offered a new threat and new justification for prolonging America's errant war in Iraq: containing Iran.

The ironic aspect of this is that Iran not only enjoys intimate relations with the Shiite government in Baghdad, but that its objectives in Iraq largely coincide with those of the United States.

Meanwhile, it seems that the Iranians have decided to cut Muqtada loose and fully line up behind the ISCI government. That counts as a form of good news, I'd say, but it also shows how ridiculous the administration's talk of anti-Sadrist operations as somehow crucial to curbing an Iranian takeover are.