Its a curious obsession says Stanley Fish. Two quotes from his article:
"In the January issue of GQ, Jason Horowitz described the world of Hillary haters, many of whom he has interviewed. Horowitz finds that the hostile characterizations of Clinton do not add up to a coherent account of her hatefulness. She is vilified for being a feminist and for not being one, for being an extreme leftist and for being a “warmongering hawk,” for being godless and for being “frighteningly fundamentalist,” for being the victim of her husband’s peccadilloes and for enabling them. “She is,” Horowitz concludes, “an empty vessel into which [her detractors] can pour everything they detest.” (In this she is the counterpart of George W. Bush, who serves much the same function for many liberals.)"
"...there is an “inexhaustible fertile market of Clinton hostility,” but that “the search for a unifying theory of what drives Hillary’s most fanatical opponents is a futile one.” The reason is that nothing drives it; it is that most sought-after thing, a self-replenishing, perpetual-energy machine."
Note the comparison with George Bush. He is also the focus of indiscriminate rage by a passionate fringe. It's a mind set that helps people frame the political world in a way that makes sense to them, but perhaps with little basis in reality. Is it healthy for democracy? Is it an inevitable by-product of the internet age?