For someone who thinks of people, influence might come from people who've managed to impose a certain kind of formal or informal rules on the people.
I approach polling as a professional in the art. Some questions are questions of fact. Other are questions of opinion. Sometimes the opinion is asked with a strict definition of key words, sometimes the question may be properly answered with a larger set of definitions in mind.
Exacting types might find any "openness to interpretation" and "opinion" an error of methodology, but conveniently, that's just an opinion