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Just minutes before anti-riot police charged opposition marchers in Tehran last week, a new chant bubbled up from the crowd: "Death to Nobody."
It was more than just a play on the "Death to America" slogans that are staples of Iran's political life. The cries give a sense of how much the protest movement has evolved since the raw outrage of last summer.
The demonstrations have moved beyond narrow attacks on President Mahmoud Ahmadinejad and his disputed re-election in June. They are now drifting toward a blanket challenge of the Islamic leadership's right to rule.
"It's gone from anti-Ahmadinejad to more of anti-regime in general," said Mustafa Alani, a regional analyst at the Gulf Research Center in Dubai. "That's an important shift."
And here lies the protesters' strength, but also their potential unraveling, some experts say.
An overall challenge to the powers of non-elected clerics - headed by Supreme Leader Ayatollah Ali Khamenei - could provide the big picture goal to sustain the demonstrations for years. But it also carries risks. Top among them: alienating the opposition leadership, who remain still loyal to the Islamic system, and bringing even harsher crackdowns by authorities who can justify use of violence to protect the status quo.
The two senior figures in the opposition, Mir Hossein Mousavi and Mahdi Karroubi, have repeatedly said they do not seek to overthrow the ruling clerics. Since July, authorities have put on trial more than 100 pro-reform figures accused of being part of a plot to topple this religious hierarchy.
Mousavi and Karroubi's reluctance could leave room for more militant opposition leaders to emerge in the future.
The protests last week coincided with state-run rallies marking the 30th anniversary of the takeover of the U.S. Embassy in Tehran. The timing, like the shouts of "Death to Nobody," were a symbolic challenge to one of the ideological pillars of the regime - the anti-U.S. fervor of the 1979 Islamic Revolution that toppled the pro-American shah.
Just blocks away from the opposition marches, the pro-government demonstrators were bellowing the standard beat of "Death to America" to mark the Nov. 4 embassy seizure.
Many pro-reform marchers still wore the green colors of Mousavi, who claims he is the rightful winner of the June 12 presidential election.
But much of the protesters' defiance went beyond Mousavi's complaints over the election and the subsequent crackdown and targeted Khamenei in acts that were almost unthinkable before the postelection meltdown. Protesters tore up or trampled images of the supreme leader, whose most ardent backers believe is answerable only to God.
Demonstrators also called on President Barack Obama to pick a side, in apparent frustration with White House efforts for direct talks with Iran's leaders. "Obama, Obama, you are either with them, or with us," they chanted.
The opposition leaders were not among the crowd. Reformist web sites say hard-line vigilantes kept Mousavi from leaving his office. Karroubi was overcome by tear gas and left before riot police moved in, according to his Web site.
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