Yes, the President Bush seen publicly is a clone. It was only when he became governor of Texas that it occurred to the powers that be to have him cloned. By that time, alcohol had seriously compromised his physical and mental status, so the first clone could only be a poor specimen.
Because the art and science of human—or even animal—cloning is far from perfected on Earth, there is deterioration with each successive clone, so a replacement cannot be in much better condition than the predecessor. And since the brain’s storage unit cannot be downloaded into a physically-ready clone until a new one is required, because all knowledge to that date must be included, by now there is little chance that Bush’s mental condition will improve.
Source: Matthew's Message, August 9, 2004.