I thought I had heard just about every conceivable “explanation” from the Birthers about why President Obama has not released the documents that they claim would prove he was born in the United States.

But apparently I was wrong, because last week Joseph Farah of WorldNetDaily appeared on the right-wing radio program “Crosstalk” and offered a new one: Obama’s maternal grandmother, Madelyn Dunham, was really his mother.

In response to a caller who said that Obama’s decision to briefly suspend his presidential campaign last year in order to visit his ailing grandmother was really a plot by Obama to get his hands on key documents in order to perpetrate a cover-up of his ineligibility, Farah responded:

Well, Madelyn Dunham is a very interesting person. As you know, Barack … the … and I want to be careful when he identify people as “mother,” “father,” “grandmother,” and so forth because honestly I don’t think we know with any certainty whatsoever who those players are in Barack Obama’s life. And perhaps he doesn’t either. I suspect he does, but it’s possible he doesn’t know. And it is entirely within the realm of possibility that Madelyn Dunham was his mother and there’s a lot of circumstantial evidence to suggest that.”

Aside from the obvious insanity of that statement, I just want to ask one question: if this were in fact true, wouldn’t it demolish the Birther movement’s foundational claim that Obama in ineligible to be president because was born in Kenya?