resident wacko) Dr. Keith Ablow visited Fox & Friends this morning and delivered such a crackpot medical analysis of Vice President Biden’s debate performance that even the hosts argued against it.

Ablow – who never considered why Fox has been obsessing about Biden since the debate – acknowledged up front that Biden could have behaved the way he did “for stage presence.” Or, Ablow said, because he “has shown tremendous disregard for the perspective of others… In other words, don’t interrupt me with the facts.”

But then Ablow got to “the part I’ll hear about:”

I did not evaluate Joe Biden but if someone said to me, "Listen, we want you to do what’s really required to know what happened there," you have to put "dementia" on the differential diagnosis… If this were your Dad or your grandfather, wouldn’t you say, if you brought him to me, "Keith, you gotta tell me, is he suffering with dementia? Because he can’t seem to listen, he’s laughing inappropriately.

You know a Fox guest has gone over the edge when two out of three co-hosts start disagreeing with something anti-Democratic. Alisyn Camerota pointed out that Biden’s “command of the details was so solid. People with dementia can’t remember.” Dave Briggs added, “The substance was pretty solid.”

But Ablow stuck to his theory: “Not knowing every fact is not required to diagnose dementia. And I’m not saying he has it, I’m saying you put it on the differential.”

Ablow wasn’t through. He also said, “You want his alcohol level.”

By the way, this is the second time in less than two months that Ablow has come up with a psychiatric assessment of Biden without benefit of examining him. After Biden made his “chains” comment (which Fox also obsessed over), Ablow called it a “moment of truth" that reveals Biden's "contempt" for "financial success."

Ablow seemed to have forgotten all about that now.

Oh and one other thing? Ablow never said that Rep. Paul Ryan won the debate against this demented lush.