“I don’t know” if Rick Perry has a fully functioning frontal lobe.  I mean, I’ve never seen it, and if I were to see it, it might be fake.  I have no reason to think otherwise, but…:

Governor, do you believe that President Barack Obama was born in the United States?

I have no reason to think otherwise.

That’s not a definitive, “Yes, I believe he”-

Well, I don’t have a definitive answer, because he’s never seen my birth certificate.

But you’ve seen his.

I don’t know. Have I?

You don’t believe what’s been released?

I don’t know. I had dinner with Donald Trump the other night.

So…

To be fair, I think having dinner with Donald Trump would guarantee a slight lowering of the IQ rate for the next 48 hours, and it’s not like Perry had a lot to spare.