Steve Clemons debriefs a source well connected to Iran's elite:
The scariest point he made to me that I had not heard anywhere else is that this "coup by the right wing" has created pressures that cannot be solved or patted down by the normal institutional arrangements Iran has constructed. The Guardian Council and other power nodes of government can't deal with the current crisis and can't deal with the fact that a civil war has now broken out among Iran's revolutionaries.
My contact predicted serious violence at the highest levels. He said that Ahmadinejad is now genuinely scared of Iranian society and of Mousavi and Rafsanjani. The level of tension between them has gone beyond civil limits -- and my contact said that Ahmadinejad will try to have them imprisoned and killed.
Likewise, he said, Rafsanjani, Khatami, and Mousavi know this -- and thus are using all of the instruments at their control within Iran's government apparatus to fight back -- but given Khamenei's embrace of Ahmadinejad's actions in the election and victory, there is no recourse but to try and remove Khamenei. Some suggest that Rafsanjani will count votes to see if there is a way to formally dislodge Khamenei -- but this source I met said that all of these political giants have resources at their disposal to "do away with" those that get in the way.