During a weekend of Republican attacks on Senator Barack Obama’s personal associations, Fox News Channel ran a program Sunday that made provocative assertions about similar connections, called “Obama & Friends: The History of Radicalism.”

Sean Hannity, the conservative radio and television host, was the host of the hourlong program, which raised, among other things, unsubstantiated accusations that Mr. Obama’s work as a community organizer in Chicago was “training for a radical overthrow of the government.”

The statement came from Andy Martin, a conservative writer and frequent political candidate who is credited as being among the first  if not the first  to assert in a chain e-mail message that Mr. Obama was secretly a Muslim.

Mr. Obama is a Christian; his campaign says he “is not, was not and has never been” a Muslim.

Peppering his statements with phrases like “in my opinion” and “my view is,” Mr. Martin said Mr. Obama’s political career had been engineered by Bill Ayers, a founder and former member of the radical Weather Underground and now an education professor in Chicago.