Advocates for additional gun control love to trot out some number, 90%(?), of Americans want background checks on guns. The language is usually imprecise and I'd bet the poll question is ambiguous, or at least different than what is being represented as having 90% support.
But so what. 90% support it. We don't have national plebiscites so it seems to me it's not the most relevant number.
We have votes by district and votes by state. Those are the counts that matter. Advocates of additional gun control may not like that way of voting, to which I can only respond, "Bummer. "