2020 presidential polls suffered worst performance in decades, report says

Another factor that contributed to problems in 2016 was that many polls did not weight their samples based on education levels, a relatively new fault line in voting behavior. The 2016 election saw clear differences in vote preferences among White voters with college degrees, who generally favored Clinton, versus those without, who generally favored Trump. By 2020, most polls did weight their samples by levels of education.

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