The regime's own cadres oppose Ahmadinejad, and the economic crisis has both deprived the regime of resources and spurred further public discontent. This provides the opening for Iranians to determine the outcome of the struggle.
Look closely at the images of mass demonstrations taking place in Iran this week and you will see them: thousands of brave Iranian women taking to the streets to protest an election they feel was stolen.
From one of many emails received post-elecion: "President Obama: Thank you for being mindful and not wanting to meddle... But why would we write our protest signs in English if we didn't want the West's help?"
With growing resentment directed against Ali Khamenei by his own peers, how ironic would it be that the first political casualty of Iran's election dispute turned out to be the supreme leader and not Ahmadinejad?
By speaking out against Ayatollah Khamenei, much of the Iranian religious establishment is in a sense questioning the concept of the wilayat al-faqih, which laid the foundation of Iran's current form of government.