I'm not convinced that he *fully* understood because the depths to which she would go to obtain and retain power had been only partially revealed by the day of his death.
I think Webb,more than anyone else,understood fully...as evidenced by his comment,while sitting in a Federal prison,that he would have to "roll over one more time" for The Former Twelfth Lady.
Partially revealed to us maybe but I'd be willing to bet that he was well aware. He probably just thought he was somehow immune. We shall never know.
Why hasn't ANYONE ever said a WORD about what they know about Vince or any of the other HIGHLY suspicious deaths in the Clintons' wake? Surely there is ONE decent person who knows something who would be brave enough to save the country from such a presidency. Maybe if her chances looked good enough someone will take the plunge?