She won't be able to live with herself if bill was elected twice by huge pluralities, while she lost the 2008 primaries to a first term nobody, and 2016 to "anybody but hillary".
She views herself as vastly smarter than bill, obama, or anyone else. Her constant theme of gender inequality suggests she truly believes she'd already be in the white house if she was born a man.
And finally Hillary -after decades in politics - views all other politicians as equally corrupt as she is, and truly cannot fathom why her deeds and words are being held against her.