It looks like Iran will investigate voter fraud and irregularities in last week's presidential election:

Iran's supreme leader ordered an investigation Monday into claims of fraud in the country's presidential election, marking a turnaround by Iran's most powerful figure, while tens of thousands of opposition supporters defied a protest ban and streamed through the streets of the capital.

Ayatollah Ali Khamenei ordered the powerful Guardian Council to examine the allegations by opposition leader Mir Hossein Mousavi, who claims widespread vote rigging and fraud in Friday's re-election of President Mahmoud Ahmadinejad, state television reported.

"Issues must be pursued through a legal channel," state TV quoted Mr. Khamenei as saying. The supreme leader said he has "insisted that the Guardian Council carefully probe this letter." The day after the election, Mr. Khamenei urged the nation to unite behind Mr. Ahmadinejad and called the result a "divine assessment."

Nate Silver has taken a look at some numbers given to him and says that it's "absolutely possible" the election was stolen, but also notes that the "statistical evidence is intriguing but, ultimately, inconclusive."