IMHO Nothing that Hillery has done or can do will get between her supporters and the next elective office that she tries for. They see and hear no evil. The next few years will be interesting for a variety of reasons.
The only votes the plantation remark will cost are those from conservatives who would never vote for her anyhoo.
(And you know who I'm talkin' about.)
Women will vote for her because, by and large, women are emotion-driven and feel that "it's about time we had a woman for President."