I suspect that for many republicans the unwillingness to vote for Hillary, even given that they are repulsed by Trump, owes as much to knee-jerk tribal loyalty than to anything Hillary has done or possibly will do. She's very much an establishment candidate, right of center on some issues, progressive on others, but far from a flaming liberal (as was Obama, although owing to the epidemic of Obama derangement syndrome sweeping the country, many on the right were blinded to this fact). As a progressive myself, I find Hillary too militaristic for my tastes and not nearly progressive enough (her complicity in the smearing of her husband's female accusers, in a very un-feminist way still leaves a bad taste in my mouth)and more of a bandwagon progressive than a committed, principled one.
I see this election as the ultimate test of the power of tribalism relative to one's true devotion to country. Trump is a dumpster fire, and his presidency portents all sorts of very horrible outcomes for this country, while Hillary is a center-right-left depending on issue establishment candidate, who will likely govern as such. Do Republicans vote their tribe, or do they vote their country? It will be very interesting to observe.