When people talk of the "closing of the conservative mind" this is what they mean: not that conservatives are more narrow-minded than other people — everybody can be narrow minded — but that conservatives have a unique capacity to ignore unwelcome fact.
When Dan Rather succumbed to the forged Bush war record hoax in 2004, CBS forced him into retirement. Breitbart is the conservative Dan Rather, but there will be no discredit, no resignation for him.
Instead, conservatives are consumed with a new snippets-out-of-context uproar, the latest round of JournoList quotations. Here at last is proof of the cynical machinations of the hated liberal media! As to the cynical machinations of conservative media — well, as the saying goes, the fish never notices the water through which it swims.