It's not easy to make the infamous Willie Horton ad from the 1988 presidential campaign seem benign. But suggesting that Barack Obama is the Antichrist might just do it.

That's just what some outraged Christian supporters of the Democratic nominee are claiming John McCain's campaign did in an ad called "The One" that was recently released online. The Republican nominee's advisers brush off the charges, arguing that the spot was meant to be a "creative" and "humorous" way of poking fun at Obama's popularity by painting him as a self-appointed messiah. But even this innocuous interpretation of the ad — which includes images of Charlton Heston as Moses and culled clips that make Obama sound truly egomaniacal — taps into a conversation that has been gaining urgency on Christian radio and political blogs and in widely circulated e-mail messages that accuse Obama of being the Antichrist.

The ad was the creation of Fred Davis, one of McCain's top media gurus as well as a close friend of former Christian Coalition head Ralph Reed and the nephew of conservative Oklahoma Senator James Inhofe. It first caught the attention of Democrats familiar with the Left Behind series, a fictionalized account of the end-time that debuted in the 1990s and has sold nearly 70 million books worldwide. "The language in there is so similar to the language in the Left Behind books," says Tony Campolo, a leading progressive Evangelical speaker and author.

As the ad begins, the words "It should be known that in 2008 the world shall be blessed. They will call him The One" flash across the screen. The Antichrist of the Left Behind books is a charismatic young political leader named Nicolae Carpathia who founds the One World religion (slogan: "We Are God&quot and promises to heal the world after a time of deep division. One of several Obama clips in the ad features the Senator saying, "A nation healed, a world repaired. We are the ones that we've been waiting for."

The visual images in the ad, which Davis says has been viewed even more than McCain's "Celeb" ad linking Obama to the likes of Paris Hilton and Britney Spears, also seem to evoke the cover art of several Left Behind books. But they're not the cartoonish images of clouds parting and shining light upon Obama that might be expected in an ad spoofing him as a messiah. Instead, the screen displays a sinister orange light surrounded by darkness and later the faint image of a staircase leading up to heaven.

Perhaps the most puzzling scene in the ad is an altered segment from The 10 Commandments that appears near the end. A Moses-playing Charlton Heston parts the animated waters of the Red Sea, out of which rises the quasi-presidential seal the Obama campaign used for a brief time earlier this summer before being mocked into retiring it. The seal, which features an eagle with wings spread, is not recognizable like the campaign's red-white-and-blue "O" logo. That confused Democratic consultant Eric Sapp until he went to his Bible and remembered that in the apocalyptic Book of Daniel, the Antichrist is described as rising from the sea as a creature with wings like an eagle.