Psychologists have found that candidates for top political offices who blink excessively during televised debates are judged by viewers to have done less well than competing candidates who exhibit average blink rates. Any impact this phenomenon has on election results is surely deleterious: Many features -- knowledgeableness, confidence, and so forth -- contribute to a political official' s ability to perform well in office, but having an average blink rate is certainly not such a feature. Which one of the following, if true, most weakens the argument? ['Excessive blinking has been shown to be a mostly reliable indicator of a lack of confidence.', "Blinking too infrequently during televised debates has the same effect on viewers' judgments of candidates as blinking excessively.", "Viewers' judgments about candidates' debate performances are generally not affected by how knowledgeable the candidates appear to be.", "Voters' judgments about candidates' debate performances rarely affect the results of national elections."]