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Five experiments were conducted with more than 4,500 participants in two countries. The experiments were randomized (subjects were randomly assigned to groups), controlled (including groups with and without interventions), counterbalanced (critical details, such as names, were presented to half the participants in one order and to half in the opposite order) and double-blind (neither subjects nor anyone who interacted with them knows the hypotheses or group assignments). The results were replicated four times.<ref name=poli/>
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In experiments conducted in the United States, the proportion of people who favored any candidate rose by between 37 and 63 percent after a single search session.<ref name=poli/>
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