It's on now in most parts of the east and central parts of the country, but times do vary.
It looks like it's already on-line at this link:
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http://www.pbs.org/wgbh/pages/frontline/showdown/view/>
As the United States and Iran are locked in a battle for power and influence across the Middle East -- with the fear of an Iranian nuclear weapon looming in the background -- FRONTLINE gains unprecedented access to Iranian hard-liners shaping government policy, including parliament leader Hamid Reza Hajibabaei, National Security Council member Mohammad Jafari and state newspaper editor Hossein Shariatmadari.
In this report, FRONTLINE examines how U.S. efforts to install democracy in Iraq have served to strengthen Iran's position as an emerging power in the Middle East.
"You will not find a single instance in which a country has inflicted harm on us and we have left it without a response. So if the United States makes such a mistake, they should know that we will definitely respond. And we don't make idle threats," Mohammad Jafari tells FRONTLINE in his first-ever television interview.
There are increasing signs that the Bush administration is considering military action before it leaves office if Tehran continues to defy U.N. demands that it cease enriching uranium for its nuclear program -- a program the Iranians insist is for peaceful purposes. "The president has said repeatedly that it is unacceptable for Iran to have nuclear weapons," former U.N. Ambassador John Bolton tells FRONTLINE. "If action is not taken in terms of regime change or, if need be, the use of military force, the question of when Iran achieves nuclear weapons is entirely in Iran's own hands. And that is extraordinarily undesirable."
(more at links below)
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http://www.pbs.org/wgbh/pages/frontline/showdown/view/>
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http://www.pbs.org/wgbh/pages/frontline/showdown/>