`I realize Joe is flirting with the enemy, but...
I wonder if he’s not just asking liberals to demonstrate how mentally deranged they are if they actually believe what the ad shows?
It’s like, Scarborough is the enemy within the liberal ranks. Except that liberals are just too dense and deranged to realize how they’re being had.
On the other hand, it could be that Scarborough has been flirting with the enemy for too long, and his mind is also being destroyed.
Your last sentence is the correct one.