I take this to mean that Severin was out of his mind for his initial prediction, and has spent the last few days waiting for the right opportunity to present itself for him to change his mind.
If Kerry said this, it is great: Bush has yet to really be able to nail the sh*t out of that nonsense argument about Tora, Bora (even though it can (and to some extent has been) nailed by Tommy Franks and Skerry's own comments about how great Bush was doing, etc.) So this will be a chance to really put that one to bed over the weekend and just show Skerry as the "say anything at any given moment" guy that he is.