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Respondents were asked, "Do you support or oppose requiring criminal and mental health background checks on all gun purchases in the United States, including at gun shows and for private sales?"
The ideology measure is based on respondent self-placement in response to the following question: "On a scale from 1 to 7, where 1 is extremely liberal, 7 is extremely conservative, and 4 is exactly in the middle, where would you place yourself?" For the purposes of this table, respondents placing themselves 1, 2, or 3 are considered "liberal"; those placing themselves at 5, 6, or 7 are considered "conservative"; and those placing themselves at 4 are considered "moderate."