He may be in the early stages of dementia. My mother suffered from this near the end of her life. You could have a perfectly normal conversation with her, then suddenly, she would start talking in great detail about things that never happened. To someone who did not know her well, the story would sound plausible, but those close to her knew it never happened. I thought about that when Biden told his fabricated story about pinning a medal on a soldier in Afghanistan. Maybe Biden was just lying, or maybe he really believed what he was saying.
“Maybe Biden was just lying, or maybe he really believed what he was saying.”
Keep in mind that we don’t see what goes on with most of the candidates, especially with regard to the handlers. In Biden’s case, I suspect that they’re pumping him full of ‘facts’ and he’s simply unable, now, to keep them organized. So he just takes bits and pieces of different ‘facts’ and says whatever comes out.