I think there is a mutual interacting and synergistic effect between the organic brain damage Bush has suffered as a result of his years of heavy drinking and drugging. We are seeing the results of that in his stammering and his generally poor cognitive performance.
I have also observed what look like symptoms of tardive diskenesia, a movement disorder caused by anti-psychotic drugs such as thorazine and haldol. This can be see when Bush blinks rapidly, when his face twitches, when one side of his face droops, and when he makes weird rolling motions with his tongue.
Of course, in addition to all the substance abuse related brain damage issues, there are underlying deep psycho-pathologies. Paul Levy has written an excellent paper at his website.
THE MADNESS OF GEORGE W. BUSH: A REFLECTION OF OUR COLLECTIVE PSYCHOSIS by Paul Levy
http://www.awakeninthedream.com/georgew.htmlexcerpt:
George W. Bush is ill. He has a psycho-spiritual dis-ease of the soul, a sickness that is endemic to our culture and symptomatic of the times we live in. It’s an illness that has been with us since time immemorial. Because it’s an illness that's in the soul of all of humanity, it pervades the field and is in all of us in potential at any moment, which makes it especially hard to diagnose. Bush's malady is quite different from schizophrenia, for example, in which all the different parts of the personality are fragmented and not connected to each other, resulting in a state of internal chaos. As compared to the dis-order of the schizophrenic, Bush can sound quite coherent and can appear like such a "regular," normal guy, which makes the syndrome he is suffering from very hard to recognize. This is because the healthy parts of his personality have been co-opted by the pathological aspect, which drafts them into its service. Because of the way the personality self-organizes an outer display of coherence around a pathogenic core, I would like to name Bush's illness ‘malignant egophrenic (as compared to schizophrenic) disease,’ or ‘ME disorder,’ for short. If ME disorder goes unrecognized and is not contained, it can be very destructive, particularly if the person is in a position of power.
In much the same way that a child's psychology cannot be understood without looking at the family system he or she is a part of, George Bush does not exist in isolation. We can view Bush and his entire Administration (Cheney, Rumsfeld, Rice, Wolfowitz, etc), as well as the corporate, military industrial complex that they are co-dependently enmeshed with, the media that they control, the voters that support them, and ourselves as well, as interconnected parts of a whole system, or a "field." Instead of relating to any part of this field as an isolated entity, it’s important to contemplate the entire interdependent field as the ‘medium’ though which malignant egophrenia manifests and propagates itself. ME disease is a field phenomenon, and needs to be contemplated as such. Bush's sickness is our own.
Bush supporters are not merely disinterested in seeing that they are in denial of reality; on the contrary, they actively don’t want to look at this, which is to say they resist self-reflection at all costs. Bush and his supporters perversely interpret any feedback from the real world which reflects back their unconsciousness as itself evidence that proves the rightness of their viewpoint. All of Bush’s supporters mutually reinforce each other’s unconscious resistance to such a degree that a collective, interdependent field of impenetrability gets collectively conjured up by them that literally resists consciousness.
People who don't recognize Bush's illness and support him are unconsciously colluding with and enabling in the co-creation of the pathological field that is incarnating itself into the human family. People who support Bush become unwitting agents through which this non-local disease feeds and replicates itself. By supporting Bush they are collaborating with and becoming parts of the greater, interconnected and self-organizing field of the disease.
full article and many similar articles at above link