Centerfield

The tape indicated that Mr. bin Laden has apparently moved the fomenting of a revolution in his Saudi homeland toward the top of his lengthy and ambitious wish list, which also includes the reversal of American foreign policy in the Middle East, the retreat of the American military from the Arabian Peninsula and the creation of a Palestinian homeland.

Mr. bin Laden has advocated these sea changes before. What intelligence officials and terrorism experts find particularly remarkable in his recent pronouncements is a shift in style from the raw anger and dark imagery of the post-9/11 days. They say he has subtly tempered his message, tone and even persona, presenting himself almost as an ambassador, as if he sees himself as an elder statesman for a borderless Muslim nation.

Perhaps most striking is Mr. bin Laden's expression of frustration. Like any politician on the stump, Mr. bin Laden craves the ability to deliver an unfiltered message to his audience. Speaking directly to Americans in the pre-election address, he complained that his rationale for waging a holy war against the United States was repeatedly mischaracterized by President Bush and consequently misunderstood by most Americans.

To change this, Mr. bin Laden is testing what he apparently believes are more mainstream themes, while trying to dislodge the entrenched American view of him as a terrorist hell-bent on destroying America and all it stands for. In the pre-election address, Mr. bin Laden said Mr. Bush was wrong to "claim that we hate freedom." He added: "If so, then let him explain to us why we don't strike, for example, Sweden."

What they cannot say is whether the less strident approach means that he has changed his goals and is less of a danger or that he is just laying the groundwork to justify a new attack against the United States. But they are listening closely and debating an important question: Is Mr. bin Laden committed to destroying America, or has he become more pragmatic, trying to begin a rational foreign policy debate about its presence in the Middle East and even appealing to Americans' pocketbooks?

Mr. bin Laden's attempt to engage Americans is occurring while his message to drive the United States out of the Muslim world is resonating with those among the 1.2 billion Muslims who believe the Qaeda leader eloquently expresses their anger over the foreign policies of the United States and Israel. In recent years, he has emphasized the Palestinians' struggle. "His genius lies in identifying things that are easily visible and easily felt by most Muslims," Mr. Scheuer said. "He has found issues that are simple, and that Muslims see playing out on their televisions every day."

But Mr. bin Laden also wants Americans and Europeans to heed his messages and urge their leaders to change their Middle East policies. This has not happened and probably will not happen. "He is tuned out by most Americans and Europeans, and it's begun to really annoy him," said a senior counterterrorism official based in Europe.

In his pre-election address, Mr. bin Laden seemed irritated that interviews he gave to Western journalists in the 1990's went largely unheard by most Americans. He appeared to suggest that if American leaders had listened to his warnings that the United States must change its foreign policy in the Middle East or face the consequences, the Sept. 11 attacks could have been avoided.

Analysts say Mr. bin Laden's repeated refrain is that Al Qaeda's strikes are retribution for American and Israeli killings of Muslim women and children. "Reciprocity is a very important principle in the Islamic way of the world," Mr. Scheuer said. "They judge how far they can go by how far their enemy has gone."

What stood out in the pre-election message was Mr. bin Laden's bid to reinvent himself. He traded his battle fatigues, his AK-47 and a rough-terrain backdrop for a sensible sheik's garb, an anchor desk and a script without a single phrase portending a clash of civilizations. No longer was he reflecting on his own possible martyred death in the "eagle's belly" - the United States - as he did in 2002, nor did he threaten another spectacular attack against America.

Jessica Stern, a Harvard professor who lectures on terrorism, said she was most surprised by Mr. bin Laden's detailed comments about the American economy. "It seemed as if he was trying to appeal to more moderate Muslims, who might have found his 1998 fatwa to kill all Americans morally repulsive," said Ms. Stern, the author of "Terror in the Name of God: Why Religious Militants Kill." "His message on this tape is not nearly as offensive. He talks about Americans having a choice - it is up to us to decide whether we will support a foreign policy that he says is bad for our economy and bad for the Islamic world."

Does Mr. bin Laden's more moderate style mean there is less risk of a terrorist strike on American soil? Intelligence analysts are unsure. More than one analyst discerned an ominous warning embedded in his milder pre-election address.