God damn the guy is an idiot... blaming a sleeping pill doesn't help at all, because he damn well knew when he'd be on the debate, either he used the pills regularly, and knew how they effected him, or he hadn't, and he was a complete dumbass trying out a new medication right before the most important public visit for his campaign.
I find it completely impossible to believe that before the democratic primary, that half of states didn't even bother letting happen, that advisors around biden could tell, that he was at diminished capacity at least 10% of the time... of which, no you can't be a good president and not be ready to be at 100% at any given moment.