"The most persistent falsehood about Senator Barack Obama's background first hit in 2004 just two weeks after the Democratic convention speech that helped set him on the path to his presidential candidacy: "Obama is a Muslim who has concealed his religion."

That statement, contained in a press release, spun a complex tale about the ancestry of Mr. Obama, who is Christian.

The press release was picked up by a conservative Web site, FreeRepublic.com, and spread steadily as others elaborated on its claims over the years in e-mail messages, Web sites and books. It continues to drive other false rumors about Mr. Obama's background.

Just last Friday, a woman told Senator John McCain at a town-hall-style meeting, "I have read about him," and "he's an Arab." Mr. McCain corrected her.

Until this month, the man who is widely credited with starting the cyberwhisper campaign that still dogs Mr. Obama was a secondary character in news reports, with deep explorations of his background largely confined to liberal blogs."

"An examination of legal documents and election filings, along with interviews with his acquaintances, revealed Mr. Martin, 62, to be a man with a history of scintillating if not always factual claims. He has left a trail of animosity some of it provoked by anti-Jewish comments among political leaders, lawyers and judges in three states over more than 30 years.

He is a law school graduate, but his admission to the Illinois bar was blocked in the 1970s after a psychiatric finding of "moderately severe character defect manifested by well-documented ideation with a paranoid flavor and a grandiose character."

"When questions were raised last week about Mr. Martin's appearance and claims on "Hannity's America" on Fox News, the program's producer said Mr. Martin was clearly expressing his opinion and not necessarily fact.

It was not Mr. Martin's first turn on national television. The CBS News program "48 Hours" in 1993 devoted an hourlong program to what it called his prolific filing of frivolous lawsuits. He has filed so many lawsuits that a judge barred him from doing so in any federal court without preliminary approval.

He prepared to run as a Democrat for Congress in Connecticut, where paperwork for one of his campaign committees listed as one purpose "to exterminate Jew power." He ran as a Republican for the Florida State Senate and the United States Senate in Illinois. When running for president in 1999, he aired a television advertisement in New Hampshire that accused George W. Bush of using cocaine."

"Theories about Mr. Obama's background have taken on a life of their own. But independent analysts seeking the origins of the cyberspace attacks wind up at Mr. Martin's first press release, posted on the Free Republic Web site in August 2004.

Its general outlines have turned up in a host of works that have expounded falsely on Mr. Obama's heritage or supposed attempts to conceal it, including "Obama Nation," the widely discredited best seller about Mr. Obama by Jerome R. Corsi. Mr. Corsi opens the book with a quote from Mr. Martin.

"What he's generating gets picked up in other places," said Danielle Allen, a professor at the Institute for Advanced Study at Princeton University who has investigated the e-mail campaign's circulation and origins, "and it's an example of how the Internet has given power to sources we would have never taken seriously at another point in time."

"Ms. Allen said Mr. Martin's original work found amplification in 2006, when a man named Ted Sampley wrote an article painting Mr. Obama as a secret practitioner of Islam. Quoting liberally from Mr. Martin, the article circulated on the Internet, and its contents eventually found their way into various e-mail messages, particularly an added claim that Mr. Obama had attended "Jakarta's Muslim Wahhabi schools. Wahhabism is the radical teaching that created the Muslim terrorists who are now waging jihad on the rest of the world."

Mr. Obama for two years attended a Catholic school in Indonesia, where he was taught about the Bible, he wrote in "Dreams From My Father," and for two years went to an Indonesian public school open to all religions, where he was taught about the Koran."

"In his original press release, Mr. Martin wrote that he was personally "a strong supporter of the Muslim community." But, he wrote of Mr. Obama, "it may well be that his concealment is meant to endanger Israel." He added, "His Muslim religion would obviously raise serious questions in many Jewish circles."

Yet in various court papers, Mr. Martin had impugned Jews.

A motion he filed in a 1983 bankruptcy case called the judge "a crooked, slimy Jew who has a history of lying and thieving common to members of his race."

In another motion, filed in 1983, Mr. Martin wrote, "I am able to understand how the Holocaust took place, and with every passing day feel less and less sorry that it did."

THIS is the kind of man the right wingers have been parroting.

A liar, anti-Semite, and lunatic.

I hope every right winger who believed this guy's bullshit feels ashamed.

You've been 'tooled'.

Look up 'gullible' in the dictionary.

FOX is not a very responsible news agency if they allow false stories to show on there network.

JOEL

This is the very crap the doddering masses attending McCain and Palin's campaign stops actually BELIEVE.

It's amazing how gullible the right wingers are.

See the old lady at a McCain stop yesterday who started off, "I'm scared of Obama. He's an Arab..."?

Pitiful right wing is just beyond ridiculously gullible.

FOX has been running this crap for over a year now.

24/7

It's sad their viewers believe a word they hear on there.

Lou Dobbs should move to FOX with his atitude of late.