[Hillary Clinton is] the woman who has been the target of possibly the greatest amount of sexism and misogyny over the course of a single political career.
While it could be argued that that statement is true, only the length and profile of that career makes it so. In any given female politician's career she will likely suffer at least as much sexism as Ms Clinton has, if we break it down on a year by year basis. Sadly, female politicians in this country face outsize hatred from the right (and sometimes the center as well). I don't think Secretary Clinton's experience is notably worse than that of any woman in Democratic politics.
Women on the right tend to get a bit of a pass from the rightwing pundits and pols. Ann Coulter will never have it as tough as Rachel Maddow. Olympia Snowe with never suffer what Debbie Wasserman-Schultz does. That's sort of a given.