You shouldn't make cross-participant comparisons based on a small non-randomized data set. Stick to within-subject comparisons if you want to analyze your data or look at other studies that have already analyzed your questions.

The answer, by the way, is that conservatives and liberals score about equally on political knowledge and intelligence but liberals are significantly more open-minded. I wouldn't at all be surprised, however, if you're getting conservatives upvoting liberals more which is likely a selection effect.