I'm not starting rumours here, just speculating that might be the case, who knows, some people have "open marriages", few Progressives or Liberals would make that the basis for dismissal of a politician. Maybe they did not, but she just kept accepting the unacceptable.

A feminist might have problems seeing Hillary as a role model for agreeing to that, but that is not a matter of conventional "morality" per se, but of self-respect, power in the relationship, etc.. Relatonships are complicated.