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Ahmadinejad's domestic opponents, including the Supreme Leader would like to contain Ahmadinejad, and I am certain that if it was politically expedient or even possible, they would have already done so.
The problem for the Supreme Leader, is that he made some judgement calls which have reduced his options. He has essentlally cornered himself. He cannot get rid of Ahmadinejad without the potential of incurring potentially fatal damage to his own reputation.
Ayatollah Khamenei's fate is, in this way, tied to Ahmadinejad's.