The argument for ambiguity is getting weaker and weaker. It used to be that one could say that if everything were fully acknowledged, the public would force the U.S. into a dangerously premature war with Iraq. Now, however, the war is on.
So, what would happen at this stage if the ambiguities were resolved? I don't think it would drive public opinion to take a stance on specific military questions, such as an invasion of Baghdad. At this point, is it only about protecting the stock market? (I wouldn't minimize the importance of the stock market, but still....)
For one thing, it would make it very, very difficult for Bush to cut a deal with Hussein where he gets to leave the the country. And, even though nobody wants to admit it or talk about it, that is our best hope, and perhaps are only hope, for an end to this conflict that does not involve massive allied civilian casualties.