I don't think it is a good idea to confirm that information is classified. Then the enemy know that it represents official thinking.
Berger is working for Kerry. The document that people are speculating about was written by Clarke at the request of Berger. I would expect that whatever Berger writes for Kerry would reflect what he has learned in his former position. He can't plagiarize his own policy papers.
...and I don't think it's a good idea to remove our posts just because one person thinks they may be damaging. Let the truth surface. No one ever got hurt by the truth, except for the liars.
As for the plagiarism statement, a speech writer for Kerry could have lifted the wording from the stolen secret document. This was suggested yesterday. I think it is obvious that the Kerry camp is in full panic reactive mode, and doing their best to cover any tracks. We'll see how long this lasts.