From Juan Cole, via Kevin Drum:
Sadr spokesman Salah al-Obeidi (al-Ubaydi) in Najaf bitterly attacked Iran, accusing it of seeking to share with the US in influence over Iraq. He pointed to the Iranian’s regime’s failure to condemn the long-term mutual security agreement being crafted by the Bush administration and the al-Maliki government. Al-Obeidi’s angry denunciation suggests that Iran is backing PM Nuri al-Maliki and his current chief ally, the Islamic Supreme Council of Iraq led by Abdul Aziz al-Hakim against the Sadr Movement of Muqtada al-Sadr.
This could be misinformation or it could be the beginning of something major.