Trump’s Up 3! Clinton’s Up 9! Don’t BeFooled By Polling Bounces

Slate – August 5, 2017

Recent research, however, suggests that swings in the polls can often be attributed not to changes in voter intention but in changing patterns of survey nonresponse: What seems like a big change in public opinion turns out to be little more than changes in the inclinations of Democrats and Republicans to respond to polls.

Samples, timing, questionnaire “art”
Any wonder polls may be poles apart.

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