"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.