Iran's president will likely swagger into New York next week in much the same style as past visits for the annual U.N. General Assembly: ready to take his jabs at America on its home turf. But any outward confidence on the big U.S. stage contrasts sharply with his increasingly public power struggles back in Iran that could shape the tone of the Islamic republic for years to come. President Mahmoud Ahmadinejad - who was a divisive figure in Iran after his disputed re-election last year - is now the great divider among the conservative leadership as the threat fades from the battered and dispirited opposition, analysts say."They have generally gotten rid of the Green Movement and now they are fighting among themselves," Mehrzad Boroujerdi, an expert on Iranian affairs at Syracuse University, referring to the opposition movement.Just in the past week, Ahmadinejad was hit with a series of slaps - including the judiciary commandeering the exit rules for jailed American hiker Sarah Shourd. It adds up to more evidence that the old guard clerics and others are pushing back harder against Ahmadinejad's political hungers.Their complaint basically is that Ahmadinejad is trying to redraw the political flow chart. Since the Islamic Revolution, it's been easy to follow: the ruling clerics on top and the elected officials - including the president - notches lower. Ahmadinejad appears to be constantly testing the system - and possibly the patience of theocracy - by trying to expand the autonomy of his office in policy decisions and filling key posts. There is also a question of his biggest ally, the hugely influential Revolutionary Guard, and whether it wants to stretch its portfolio even further.The Guard already controls almost everything of importance in Iran - from protecting the nuclear program to directing the Basiji paramilitary corps. These were the front-line forces set loose against protesters who alleged that ballot fraud handed Ahmadinejad another term in office until 2013.