Now a pair of obscure filmmakers say they created Martin Eisenstadt to help them pitch a TV show based on the character. But under the circumstances, why should anyone believe a word they say?

“That’s a really good question,” one of the two, Eitan Gorlin, said with a laugh.

(For what it’s worth, another reporter for The New York Times is an acquaintance of Mr. Gorlin and vouches for his identity, and Mr. Gorlin is indeed “Mr. Eisenstadt” in those videos. He and his partner in deception, Dan Mirvish, have entries on the Internet Movie Database, imdb.com. But still. ...)

The pranksters behind Eisenstadt acknowledge that he was not, through them, the anonymous source of the Palin leak. He just claimed falsely that he was the leaker--and they say they have no reason to cast doubt on the original story. For its part, Fox News Channel continues to stand behind its story.

Mr. Gorlin and Mr. Mirvish say the blame lies not with them but with shoddiness in the traditional news media and especially the blogosphere.

“With the 24-hour news cycle they rush into anything they can find,” said Mr. Mirvish, 40.

Mr. Gorlin, 39, argued that Eisenstadt was no more of a joke than half the bloggers or political commentators on the Internet or television.