I think they call that a Freudian slip.
yes, the Freudian slip observation was mentioned several posts ago, as it was in comments about the DNA statement.
“slip of the tongue motivated by and revealing some unconscious aspect of the mind”
My point is that “the unconscious aspect of mind” Gibb’s is revealing right now is FEAR. This is the second time in a short span. He is seriously psychologically conflicted — approach-avoidance; fight-flight. And, depending on what he does or does not know, probably struggling with doubt or guilt.
From Rendell’s statement is does look like he was supposed to use the birther crazies line to deflect heat from the townhall fiascos...so we know why he brought it up, but what the Freudian slip revealed is FEAR. That is an encouraging sign.