Whether or not that constitutes a “valid case for an argument AGAINST research into therapeutic cloning” is a matter for Great Debates, not General Questions. We can discuss what the President’s stand is in this thread, but anyone wanting to discuss whether his stand is the right one or not should start a separate thread in GD.
Bush may be against all forms of cloning, but his argument against it flys in the face of the administration’s view on in vitro fertilization, which destroys many embryos for each successful pregnancy produced. From Slate, The Incoherent Embryophile
Clearly, Bush knows that those who can afford in vitro ferilization included well heeled conservatives desparate for children, so he will talk out of both sides of his mouth to appeal to all ends of the conservative spectrum, no matter how contradictory the messages are, nor how transparently political the motives appear.