Rush is quite fluent in the COTUS and I strongly believe that he knew the definition of natural born Citizen at the time or certainly his awesome inquisitiveness would have compelled him to find out.
Rush fully understood that obozo was a Dual citizen, and thus not Constitutionally eligible, aside from unverified birthplace. I was truly expecting him at that time to carefully explain all of it.
I've been listening since the first month he went national and love him. This is the only time I've ever been disappointed in him.
You’re welcome!
PS: I’ve never been disappointed in him, myself.