If Mr. Bernstein's sources actually exist, and if they are as numerous as he says, and if they are as senior and as well-informed as he says, and if they are as alarmed for the fate of the country (as opposed to preserving their own influence and material well being) as he says, then surely he should be able to produce at least one on-the-record quote from one of them.
 
Until that happens, colour me skeptical.