It's not the brains, but rather the ideas, the conceptual framework, the basic assumptions, the most cherished beliefs.
In AA, there's a saying that an active alcoholic's brain is like a pot full of shit- it's a perfectly good pot, but you have to clean it out completely before you can cook in it...
In more technical matters, like troubleshooting malfunctions in a complex machine, sometimes the reason a tech isn't able to figure it out is because they won't back up, completely re-evaluate their own methods & what they think is true in the first place.
Conservatives rarely do that, tend to sanctify what they already believe, consider it to be inviolable, beyond question, which is precisely what Obama points out.
I also think that in order to understand the current state of impasse, of lack of civility & respect, we need to see it in historical terms, to understand who's used language as a weapon most effectively, who advocates using it in such a fashion-
http://www.fair.org/index.php?page=1276