Nate Silver: “So as long as I’ve been covering politics, people have been fascinated by internal polls (surveys that the campaigns themselves or closely affiliated partisan groups conduct). Especially given the high-profile public polling misses in recent years, surely the campaigns know the real story of the race?”
“Well, no. Or at least, not necessarily. If you really knew what the campaigns knew, that would probably provide valuable information. But unless you’re an Iranian or Russian hacker, you probably don’t. Instead, you know what the campaigns want you to know.”
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