Maybe somebody slipped him a “tell-the-truth” pill when he wasn’t looking. Dropped it in his food or drink before he went on.
No, Bill sees that Clinton Inc is about to lose the race, and he fully appreciates what that portends.
At the eleventh hour, his (admittedly masterful) political instincts are kicking in, and he’s attempting to re-position Hillary in the minds of voters.
Watch for the lamestreams to pick up on his cue, and begin painting Hillary as an outsider.