Iran’s President Ahmadinejad and the Shiite Muslims believe in the Mahdi and think he could be coming any day, to destroy their enemies and rule the world with Shiite Islam. That’s a large part of why he does the things he does. Consequently, we: everyone in Israel and the US, in Iraq and Europe and the rest of the world should care about what is driving this strange and dangerous movement.
MEMRI has published an excellent article online in PDF format, dealing with Mahdism and Iran. Read the article.