This thread contains lots of great perspectives on Ahmandinejad, election fraud, and the Iranian presidency. Unfortunately most of the world is missing the point.
I'd like to point that
Ali Khamenei has been the supreme leader (dictator) of Iran for 20 years. During an
EconTalk podcast on August 11 2008, expert Bruce Bueno de Mesquita comments that after interviewing over a dozen Iranian political specialists, his research concludes that Ahmandinejad is the 18th most powerful person in Iran.
The Iranian president is an important and powerful person in absolute terms. In relative terms it's a public relations office. So yes, election fraud was committed. Yes, their disinterest in concealing the fraud conveys the extent to which they believe it makes a difference.
However, everyone just take a deep breath, and understand that the electoral system and eligibility of candidates is up to the complete discretion of Ali Khamenei.