Andrew Sullivan provides a helpful graph plotting the ratio of Ahmadinejad to Moussavi votes in six different counts. That ratio proves to be remarkably consistent at each count:
Sullivan’s conclusion:
They didn’t even attempt to disguise the fraud. Which, to me, tells me they panicked. This graph is a red flag to Iran and the world.
Update: Nate Silver’s done a fairly comprehensive rebuttal of this graph – see here. He concludes,
these results certainly do not prove that Iran’s election was clean. I have no particular reason to believe the results reported by the Interior Ministry. But I also don’t have any particular reason to disbelieve them, at least based on the statistical evidence … I am not suggesting that any and all statistical analysis purporting to show tampering in Iran’s election results will turn out to be fruitless. I am merely suggesting that this particular analysis is dubious; it is not a smoking gun.