Are nukes centralizing power in Iran?

The NYT reports today that Iran's President Mahmoud Ahmadinejad is consolidating power in a nation that, since the '79 revolution, has always had a weak president. Apparently, it's always been hard to tell who is calling the shots in Iran, especially after the death of Ayatollah Khomeini.

Now, Ahmadinejad is becoming a powerful president, apparently with the support of Iran's Supreme Religious Leader. Maybe since they expect to have their own nuclear weapons in a few years, they recognize the importance of a clear chain of command.