Do you know what "cocooning" is?
It's when a group becomes so insular, they no longer effectively have any communication with anyone or anything outside it.
One famous example was the liberal who said "I don't know how Richard Nixon could have won. I don't know anybody who voted for him."
The amazing part of this is that Newsweek honestly thought they were doing Obama a favor.
Your link didn't work for me, possibly because the double-dash in the address was automatically reformatted into an m-dash. Here it is.