- ambivalence, which is basically a balance between positive and negative attitudes about some object (a political actor or institution or issue)
- indifference, a complete lack of affect but apparently not brain-dead
The real question for me is not who are the indifferent -- they resemble the apolitical or chronic know-nothings -- but who are the ambivalent. The author here uses the traditional like/dislike questions from the American National Election Studies to measure this, but I have some concerns. Often respondents pony up likes and dislikes in odd ways and I'm not completely comfortable with calling a raw count ambivalence. Unfortunately I don't have a better solution, and it's not my study, so let's go with it for now. Maybe buried in the text I missed an explanation of who is indifferent versus ambivalent. If someone finds it, let me know, but I'd love a breakdown by SES and political factors, including knowledge.