The contrast between his linguistic bumbling today and his verbal facility and acumen ten years' ago is somewhat mystifying. I don't buy the "pre-senile dementia" theory. Is he exhausted? Have five years of war worn him down? Or has he decided that obfuscation is a better strategy than clarity? Anyway, here are some clips. They contrast the earlier best with the current worst. But the contrast is a little too great to be dismissed as a function of clever editing.