Have you seen the “Bush Drunk” videos? Videos both old and new with Bush slurring his words. Some are fakes (but hilarious), but there are some where he appears either to have had a few or to be speaking with his mouth full of marbles (or maybe just out of the dentist chair where he had 5 cavities filled – and over novocained). The first one is a pre-public service video at a Texas wedding and he has obviously had a few.
The rest? Who knows?