At its simplest level, all you have to do is present a stimulus that brings the candidate to mind--a name, a picture, whatever--and follow it rapidly with something that evokes a strong feeling of disgust. Do it repeatedly. Eventually, any stimulus associated with the target candidate evokes the feeling of disgust. And that kind of conditioning, which we have known about since Pavlov in the 1890's, cannot be simply overcome with rational argument or the like.

You can also do the reverse, using some stimulus that evoke the candidate and follow it with something that evokes a pleasant emotion in the "trainees."

Watch the media start in on Bernie.