I am not calling calling Carly Fiorina a witch. This is rather a reference to the report that when Fiorina was fired from HP, that people there started singing the song spontaneously.
I imagine that after a series of gaffes, McCain staffers are singing it to, because following her latest screw-up, where she said that neither Palin nor McCain (later modified to include Obama and Biden) were qualified to run a large company, she has been kicked off the campaign circuit.
Of course, experience at HP would appear to indicate that she wasn’t qualified to run a large company either.