I wasn't saying that being a moderate required impartiality.
I was saying that you are most likely not impartial when you judge yourself. Since your opinion of yourself is not impartial, it is most likely not the most accurate gauge of whether or not you are actually moderate.
On the other hand, another person, judging your words and actions impartially, may be better able to determine whather or not you are a moderate, meaning that he or she "can tell better than...the actual person."
