Obama is trying to be proactive about the email chain letters containing falsehoods about his religious background:

The Obama campaign announced the debunking effort with an e-mail barrage from John Kerry of Massachusetts, in which the former presidential candidate urges supporters to “e-mail the truth” to everyone on their address books, to print out the facts about Obama’s background and post them at work, and to call local radio stations and talk to neighbors.

Wired talked to Gary Alan Fine about whether this strategy would work and Fine was skeptical. “It underlines the attack,” Fine says. “Sometimes defenses against rumors work; sometimes they backfire…What you want to do, when you deny the rumor, you only want to deny it to the people who originally heard it.”