The Delta experiment varied which voter group allegedly determines the election

Evidence

Some subjects considered the party supporter’s theory. According to this theory, the nonaligned voters would split their vote fairly equally across the two parties. The electoral outcome would be determined by whether the supporters of party A or party B became more involved in the election. The political experts were split as to whether the supporters of A or B would become more involved, but all agreed that the party whose members did become more involved would win by a margin of roughly 200 thousand to 400 thousand votes. Other subjects received the non-aligned voter’s theory, which held that the supporters of each party would vote in equal numbers. The electoral outcome would in this account be determined by whether the nonaligned voters would swing their support primarily to party A or party B. The experts were split as to which party would capture the majority of the nonaligned voters, but all agreed that the fortunate party would win by a margin of at least 200 thousand votes. — John T. Jost and Jim Sidanius, Political Psychology, 2518