Mr. Ahmadinejad was credited with more votes than anyone in Iran's history. If the results are to be believed, he won in all 30 provinces, and among all social and age categories. His three rivals, all dignitaries of the regime, were humiliated by losing even in their own hometowns. This was an unprecedented result even for the Islamic Republic, where elections have always been carefully scripted charades.

Many in Tehran, including leading clerics, see the exercise as a putsch by the military-security organs that back Mr. Ahmadinejad. Several events make these allegations appear credible. The state-owned Fars News Agency declared Mr. Ahmadinejad to have won with a two-thirds majority even before the first official results had been tabulated by the Interior Ministry. Mr. Ahmadinejad's main rival, former Prime Minister Mir Hossein Mousavi, retaliated by declaring himself the winner. That triggered a number of street demonstrations, followed with statements by prominent political and religious figures endorsing Mr. Mousavi's claim.

Then something unprecedented happened. Supreme Leader Ayatollah Ali Khamenei, who has the last word on all issues of national life, published a long statement hailing Mr. Ahmadinejad's "historic victory" as "a great celebration." This was the first time since 1989, when he became supreme leader, that Mr. Khamenei commented on the results of a presidential election without waiting for the publication of official results. Some analysts in Tehran tell me that the military-security elite, now controlling the machinery of the Iranian state, persuaded Mr. Khamenei to make the unprecedented move.

A detailed study of Mr. Khamenei's text reveals a number of anomalies. It is longer than his usual statements and full of expressions that he has never used before. The praise he showers on Mr. Ahmadinejad is simply too much. The question arises: Did someone use the supreme leader as a rubber stamp for a text written by Mr. Ahmadinejad himself? With Mr. Khamenei's intervention, Mr. Ahmadinejad's three defeated rivals are unlikely to contest the results of the election beyond lodging formal protests to the Council of the Guardians, a 12-mullah body that has the legal duty of endorsing the final results.

Buoyed by his victory, Mr. Ahmadinejad has already served notice that he intends to pursue his radical policies with even greater vigor. At yesterday's rally, he promised to pass a law enabling him to bring "the godfathers of corruption" to justice. His entourage insists that former Presidents Hashemi Rafsanjani and Mohammed Khatami, and former parliament Speaker Nateq Nouri, all midranking mullahs, may be among the first to fall in a massive purge of the ruling elite.

It is too early to guess whether these dignitaries would march to the metaphorical gallows without a fight. Even if they fight, they are unlikely to win. Nevertheless, Messrs. Rafsanjani, Khatami and other targeted mullahs could influence others who wish to prevent a complete seizure of power by Mr. Ahmadinejad's military-security clique, which is determined to replace the Shiite clergy as the nation's ruling elite. Nor is it at all certain that Supreme Leader Khamenei would stand by and watch his power eroded by a rising elite of radicals.

Mr. Ahmadinejad also plans to seize the assets of hundreds of mullahs and their business associates for redistribution among the poor. In his speech at his victory rally yesterday he promised to "dismantle the network of corruption," and vowed never to negotiate about Iran's nuclear program with any foreign power: "That file is shut, forever," he said.

Mr. Ahmadinejad's victory has several immediate consequences. First, it should kill the illusion that the Khomeinist regime is capable of internal evolution towards moderation. Mr. Ahmadinejad sees Iran as a vehicle for a messianic global revolution.

Second, the election eliminates the elements within the regime -- men such as Mr. Mousavi and Mahdi Karrubi (another of the three unsuccessful candidates who ran against Mr. Ahmadinejad) -- who have pursued the idea of keeping the theocracy intact while giving it a veneer of democratic practice. According to a statement published yesterday by Mostafa Tajzadeh, a former deputy interior minister who was among 132 anti-Ahmadinejad activists arrested over the weekend, the regime's "loyal opposition" would now have to reconsider its loyalty. With Iranian Gorbachev wannabes like Messrs. Khatami and Mousavi discredited, advocates of regime change such as former Interior Minister Abdullah Nouri and former Tehran University Chancellor Muhammad Sheybani look set to attract a good segment of the opposition within the establishment.

Mr. Ahmadinejad's victory has the merit of clarifying the situation within the Islamic Republic. The choice is now between a repressive regime based on a bizarre and obscurantist ideology and the prospect of real change and democratization. There is no halfway house.

The same clarity may apply to Tehran's foreign policy. Believing that he has already defeated the United States, Mr. Ahmadinejad will be in no mood for compromise. Moments after his victory he described the U.S. as a "crippled creature" and invited President Obama to a debate at the United Nations General Assembly, ostensibly to examine "the injustice done by world arrogance to Muslim nations."

Iran's neighbors are unlikely to welcome Mr. Ahmadinejad's re-election. He has reactivated pro-Iranian groups in a number of Arab countries, notably Saudi Arabia, Kuwait and Bahrain. He is determined to expand Tehran's influence in Afghanistan and Iraq, especially as the U.S. retreats. He has also made it clear that he intends to help the Lebanese Hezbollah strengthen its position as a state within the state and a vanguard in the struggle against Israel.

Even Latin America is likely to receive Mr. Ahmadinejad's attention. The first foreign leader to phone to congratulate the re-elected Iranian leader was Venezuela's President Hugo Chávez, whose "brotherly message" received headline treatment from the state-controlled media in Tehran. Later this year, Mr. Ahmadinejad plans to attend the summit of the nonaligned movements in Cairo to claim its leadership, according to Iran's official news agency, with a message of "unity against the American Great Satan" and its allies in the region.

Buoyed by his dubious victory, Mr. Ahmadinejad appears itching for a fight on two fronts. He thinks he can have his way at home and abroad. As usual in history, hubris may turn out to be his undoing. WSJ Online