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computer-assisted personal interview (CAPI); web-based surveyFor further information please see the ANES Data Center Web site.The Web mode respondents selected in the Pre-election interviews for the 'standard' or traditional version of 4 efficacy items should have been administered the 'revised' version of the items in the Post-election survey, and the Web respondents selected for the 'revised' version in the Pre-election survey should have been administered the 'standard' version in the Post. In reality, the 2012 Internet respondents were administered the same version of efficacy items in both the Pre- and the Post-election surveys.