How you measure political knowledge matters.
This new study reinforces that point, looking at question format and how people answer political knowledge questions. Published in the International Journal of Public Opinion Research, the author -- Joshua Robison -- uses the ANES EGSS3 data to get at a lot of different aspects and effects of question format. Important point -- using these same data, I published a similar study, one not cited here, likely because mine came out while his was in press (or he looked at mine and said, "you're kidding, right?"). His is also much broader than mine.