Elections in Iran

Recently, the republic of Iran held elections where the main candidate, current president Mahmoud Amadinejad was facing serious opposition. Well into the election, Amadinejad's fate seemed to be almost sealed with reports of his trailing his opponent significantly. However, what does not seem clear in the least is the time period immediately following the election. Following what seemed to be a rather lengthy lack of communication regarding its' outcome, the election's outcome was finally announced, with Mahmoud Amadinejad being declared the winner by a landslide. Now my question on this matter is what happened from the time he was said to be losing significantly to his alleged landslide victory? We may never know, but then again, the answer is sort of obvious!