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As always with such surveys ... it is what it is. Pew Research are highly respected; use statistically valid sampling; and are independent of the bodies being researched (ie this isn't a Sony paid for study).
Pew also updates this on a regular basis, using the same methodology, and publishes these. These are "generalizations" but that doesn't mean they aren't worthwhile. The fact that they raise many other questions points to their value as a way of thinking about these issues.
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