A few days before the election, national opinion polls confound:
The caveats and variables of modern political polling are enough to cram a clipboard. The most glaring asterisk of all — that two out of three of us refuse to be polled — is just a fact of life in public pulse-taking.
This year, pollsters agree, the dangers of getting it wrong may be greater than ever — even if in recent elections they’ve had it mostly right.
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