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Points to Note
Whether two ratings are statistically distinguishable depends on the value of their difference and the standard errors of their scores. Generally speaking, at 95% confidence level, a difference of over two standard errors can be taken as meaningful.
Whether a legislator is on the list or not is sometimes marginally determined by one's recognition rate. Higher recognition rate means more people know of the person, and can be taken as the first benchmark in comparing popularity. Support rating is the second, and the two are not necessarily related. If the recognition rate of a person is only marginal, one could top the list this time, but drop out completely next time.