Those who follow such matters already know that pollsters under-sampled white, non-college voters in 2016. Then, in 2020, Trump voters exhibited greater than average response bias as they were less likely than others in their demographic to respond to polls.
The problems with polling are not only about Trump voters, or about election projection for that matter. The core problem is that some people are less likely to respond to polls. Pollsters “correct” for this by up-weighting those who do respond – counting their responses extra and assuming the respondents represent their demographic. Some groups who are not Trump voters but consistently require up-weighting are low income people, people in minority communities, lower propensity voters, and young people. CONTINUED
Diane Feldman, View from the Pearl
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