CAIRO, Egypt —

This column will probably get Barack Obama in trouble, but that’s not my problem. I cannot tell a lie: Many Egyptians and other Arab Muslims really like him and hope that he wins the presidency.

I have had a chance to observe several U.S. elections from abroad, but it has been unusually revealing to be in Egypt as Barack Hussein Obama became the Democrats’ nominee for president.

While Obama, who was raised a Christian, is constantly assuring Americans that he is not a Muslim, Egyptians are amazed, excited and agog that America might elect a black man whose father’s family was of Muslim heritage. They don’t really understand Obama’s family tree, but what they do know is that if America — despite being attacked by Muslim militants on 9/11 — were to elect as its president some guy with the middle name “Hussein,” it would mark a sea change in American-Muslim world relations.

Every interview seems to end with the person I was interviewing asking me: “Now, can I ask you a question? Obama? Do you think they will let him win?” (It’s always “let him win” not just “win.”)

It would not be an exaggeration to say that the Democrats’ nomination of Obama as their candidate for president has done more to improve America’s image abroad — an image dented by the Iraq war, President Bush’s invocation of a post-9/11 “crusade,” Abu Ghraib, Guantanamo Bay and the xenophobic opposition to Dubai Ports World managing U.S. harbors — than the entire Bush public diplomacy effort for seven years.

Of course, Egyptians still have their grievances with America and will in the future no matter who is president — and we’ve got a few grievances with them, too. But every once in a while, America does something so radical, so out of the ordinary — something that old, encrusted, traditional societies like those in the Middle East could never imagine — that it revives America’s revolutionary “brand” overseas in a way no diplomat could have designed or planned.

I just had dinner at a Nile-side restaurant with two Egyptian officials and a businessman, and one of them quoted one of his children as asking: “Could something like this ever happen in Egypt?” And the answer from everyone at the table was, of course, “no.” It couldn’t happen anywhere in this region. Could a Copt become president of Egypt? Not a chance. Could a Shiite become the leader of Saudi Arabia? Not in a hundred years. A Bahai president of Iran? In your dreams. Here, the past always buries the future, not the other way around.

These Egyptian officials were particularly excited about Obama’s nomination because it might mean that being labeled a “pro-American” reformer is no longer an insult here, as it has been in recent years. As one U.S. diplomat put it to me: Obama’s demeanor suggests to foreigners that he would not only listen to what they have to say but might even take it into account.

My colleague Michael Slackman, the Times’ bureau chief in Cairo, told me about an encounter he had with a worker at Cairo’s famed Blue Mosque: “Gamal Abdul Halem was sitting on a green carpet. When he saw we were Americans, he said: ‘Hillary-Obama tied?’ in thick, broken English. … He didn’t have anything to say bad about Hillary but felt that Obama would be much better because he is dark-skinned, like him, and because he has Muslim heritage. ‘For me and my family and friends, we want Obama,’ he said. ‘We all like what he is saying.’”

Yes, all of this Obama-mania is excessive and will inevitably be punctured should he win the presidency and start making tough calls or big mistakes. For now, though, what it reveals is how much many foreigners, after all the acrimony of the Bush years, still hunger for the “idea of America” — this open, optimistic, and, indeed, revolutionary, place so radically different from their own societies.

I have no idea whether Obama will win in November. Whether he does or doesn’t, though, the mere fact of his nomination has done something very important. We’ve surprised ourselves and surprised the world and, in so doing, reminded everyone that we are still a country of new beginnings.