There's a great blog that deals with this very issue. In fact, he discussed the exact photo you're talking about on 9/11/06. I just took a peek and I don't see it on the main page still, but you might be able to find it in the archives.
http://bagnewsnotes.typepad.com/bagnews/
It's a liberal blog, just to be clear... I just thought his technique at analyzation may be of help, regardless whether you agree with him politically.