So how should the public interpret poll numbers?
Clinton suggested that readers should take the margin of error stated on the poll, double it, and see whether the difference between the two candidates is within the doubled margin of error. If it is, then it is hard to conclude which candidate is actually ahead in the race.
“This should be empowering because it means if a poll shows the race to be close, your vote counts even more. And don’t be too quick to predict winners based on polls, given the difficulty involved. You can never be completely sure until the votes are counted and certified,” Clinton said.
– https://web.archive.org/web/20210817130248/https://news.vanderbilt.edu/2021/07/19/pre-election-polls-in-2020-had-the-largest-errors-in-40-years/