Katie Couric's Notebook: Iran Election

Hi everyone. Katie's off today. I'm Jeff Glor.

The message from protesters in Iran today is loud and clear, but it seems to be very different from the one at the polls last Friday.

Hundreds of thousands of demonstrators marched through the streets of Tehran to support reformist presidential candidate Mir Hossein Mousavi. They've been protesting ever since hard-line incumbent Mahmoud Ahmadinejad was declared the winner by an almost two-to-one margin. It's a result many of them just don't believe.

But Ahmadinejad has his backers too. There's no proof the election was rigged. Although it doesn't help the government's case that police have beaten some of the protesters and the reporters trying to cover them.

Iran's supreme leader is promising an election fraud investigation. But, no matter who really won, the voice of the people crying out for change has been heard by the entire world this week. It might be very tough for the Iranian government to ignore.

I'm Jeff Glor. CBS News.