I've created some word clouds from http://www.wordle.net/ from speeches given over the past days in the wake of the Iran election, as reported/translated on Andrew Sullivan's blog. I find word clouds to be an interesting way to pull out the themes. (I'll add a few obvious observations as well, to show what I took out of these. I know this smacks a little of reading palms or pop psychology; I'm offering these for the fun of it alone.)
Here is Mousavi's statement from yesterday.
In this case, the emphasis on revolution refers to the Islamic revolution --
I came to invite people to join the Islamic revolution in its honorable, original form, and to re-shape it into to what it must be
He is saying that this isn't a revolt, but a people's protest against something illicit.