This could either turn into a Florida-2000 fiasco or something far more dramatic. The elections in Iran have been marked by sky-high turnout and the overall intensity of the race. While polls have long been inaccurate in Iran, they almost all pointed to a Mousavi-surge against the incumbent Ahmadinejad. There has also been countless photos and videos of Mousavi rallies, including the human chain that reached across the massive city of Tehran. There has been such enthusiasm, often directed at electing what some have tried calling "Iran's Obama"(and his wife, "Iran's Michelle Obama").
So isn't it a little brow-raising when the Iranian government declares that the incumbent has so far received almost 70% of the vote?
Allegations of voter fraud began before the polls even closed(I guess they're more like us than we often think).
The opposition-candidates boycotted the Iranian state media in the days leading up to the election.
All scientific and unscientific evidence pointed to a Mousavi-surge, yet here we are seeing the Iranian state media declare Ahmadinejad the winner with over two-thirds of the vote. Iranian polling is notoriously difficult, so it's entirely possible that some election-polls truly are even more off-the-mark than the primary-polls out of New Hampshire in '08.
Still, with both of the main candidates declaring victory, this is going to be very interesting to watch.
It's also worth noting that like in many elections, results tend to come in from the rural-areas first(See; Virginua, 2008) where conservatives do best.