[raidertx]

They were probably all political opponents he was told to fire by Ahmadinejad

[Marine_Uncle]

It could be as simple as what you say. But nothing is simple. One thing we should remember IMHO, is that the president of Iraq, Talabani a Kurd, is always sitting on the side line watching carefully as to what is done. He could if he deems it appropriate to request the Presidency Council to replace Malaki and or say his MD or MI if they continue to appear inept.
To many things that must be taken into account to settle on on e scenario. For all we know, the Iraqi president may be a driving force in any actions Maliki fails to show competence in.
I do think the current scenario of Sadr no longer backing Maliki, may be actually true. Should Hakim and his crowd also give Maliki the middle finger, then the equation changes considerably. Maliki like Sadr have been strong proponents of Shia role, but not Persian driven nor controlled.