Regretably the terrorist warnings are a damned if you do/if you dont situation. The things that would make them credible and urgent to the public would of course be the sources and methods upon which the warnings are based; but, divulging those also tells the bad guys that their security is compromised.

I happen to believe the American public would buy that argument (there is NO hope for the MSM) but this underscores the point ambi and others made on a different thread: the President needs to use the bully pulpit more than he does. His use of that pulpit will, of course, not have an effect on the punditry, but it could go a long way to informing the American public.