The Nation has a great article out on the Obama smears that are circulating, and looks at where they come from.
The purpose of the smear is to paint him as an Arab-loving, Israel-hating, terrorist-coddling, radical black nationalist. That picture couldn’t be further from the truth, but you’d be surprised how many people have fallen for it.
[. . .] We may not know who started the smears, but we do know who’s amplifying them. The “Obama is a Muslim” rumor began in the fringe conservative blogosphere. “Barack Hussein Obama: Once a Muslim, Always a Muslim,” blogger Debbie Schlussel wrote on December 18, 2006. Schlussel had a history of inflammatory rhetoric and baseless accusations. She said journalist Jill Carroll, who was kidnapped by Iraqi insurgents in 2006, “hates America” and “hates Israel”; labeled George Soros a “fake Holocaust survivor”; and speculated that Pakistani terrorists were somehow to blame for last year’s shootings at Virginia Tech. Yet her post on Obama gained traction; one month later, the Washington Times’s Insight magazine alleged that Obama had attended “a so-called Madrassa” and was a secret Muslim.