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President Obama speaks after Congress passes bill regulating tobacco companies (AP)

U.S. officials are casting doubt over the results of Iran's election, in which the government declared President Mahmoud Ahmadinejad the winner Saturday.

U.S. analysts find it "not credible" that challenger Mir Hossein Mousavi would have lost the balloting in his hometown or that a third candidate, Mehdi Karoubi, would have received less than 1 percent of the total vote, a senior U.S. officials told FOX News. 

Supreme Leader Ayatollah Khameini apparently has released a statement calling the results "final" and hailing the election as a legitimization of the regime and its elections. 

Turnout appears to have reached 82 percent, an all-time high. But when asked if the turnout figures should be considered suspect, given the "not credible" counts for Mousavi and Karoubi, the official said the turnout clearly was questionable.

There already are reports of violence outside Mousavi's campaign headquarters and of huge demonstrations for both sides in central Tehran, with Mousavi trying to make his way to the one organized by his supporters. Even if widespread violence occurs, analysts see no prospect that this event would lead to a full-scale attempt at revolution or the toppling of the regime.

The dominant view among Obama administration officials is that the regime will look so bad as a result of whipping up Iranian hopes for democracy and then squelching them that the regime may feel compelled to show some conciliatory response to Obama's gestures of engagement.