Back in April, after ABC News quoted Jerome Corsi as an authority in an article on so-called “birth tourism,” Media Matters' Todd Gregory pointed out how low ABC had sunk:

Jerome Corsi is the guy who co-wrote Unfit for Command, a book so infamously inaccurate that it helped spawn the term "swiftboating" as a description of a political smear campaign.

That alone should tell you everything you need to know about Corsi, but there are so many other reasons he's not a credible figure. There's the birtherism. The appearance on a “pro-White” radio show. The bigoted comments on Free Republic. The promotion of laughable conspiracy theories about global government and the "North American Union." The failed Obama smear book.

What has Corsi done since? Well, there's this:

Yeah, that's Corsi at the WorldNetDaily Convention last weekend, saying President Obama has engaged in “identity theft” because he has “stolen the identity of a natural born citizen” by “using someone else's Social Security number.”

He also called for Obama to “renounce Lucifer.” Seriously.

Needless to say, this is lunatic nutjobbery of the highest order.

You think ABC regrets quoting Corsi now?

Incidentally, you know who can't get enough of Corsi? Sean Hannity. According to Nexis, he's hosted Corsi six times since July 2008, most recently earlier this month.