It's not what we think it means but words/phrases don't have one strict interpretation. I don't think saying "That's gay" has anything to do with homosexuality, but people think it does. Or retard. Or fag. Should Sanders go out and say "Killer Mike is my nukka?" (censorship is obvious) Because obviously "nukka" isn't offensive it means bro, nah mean?
Pragmatically, Sanders is probably doing terrible in the women vote and no way can he advocate the use of the word 'whore' in trying to gain that vote. You're acting like a 10 year old here who doesn't understand politics and perception.