This so called “inability to articulate” is purposeful. Playing dumb as a post is a strategy as old as the hills and effective.
Falling for it is worse. These guys display tongues of silver when it’s about them or their own re-election.
The ones who can articulate it, and “get it” like Bachmann, for example, are marginalized and run off.
Some of it is no doubt. No denying that.
HOWEVER: - some of it is just reflective of how isolated and out of touch they are. These beltway Republicans - talking consultants and officials - really are as dumb as they seem sometimes.