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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →A poll estimates what a defined group of people say or intend at the time they are surveyed; election results count ballots cast in a specific contest. Neither a poll nor an election-night report is the same as the final certified result. Keeping those distinctions clear helps you interpret leads, margins of error, and changing vote totals.
What a pre-election poll tells you
A pre-election poll is a survey-based estimate of opinion or stated voting intention among a defined population at a particular time. It can show relative support or suggest movement across comparable surveys, but it does not count votes and cannot guarantee who will win. AAPOR describes pre-election polls as “snapshot-in-time estimates, not forecasts” and advises particular caution when a race is close (AAPOR, Polling Accuracy).
A reported lead is an estimate, not proof that one candidate is ahead in the electorate. When the difference between candidates is small, sampling uncertainty may make it difficult to determine who is actually leading. Polls can also differ from the eventual vote because preferences change, some groups are harder to reach or recruit, some people do not respond, and pollsters make choices about who is likely to vote.
How to read a poll’s margin of error
A conventional margin of error describes sampling uncertainty under the poll’s assumptions. It does not capture every source of error, such as nonresponse, changes in opinion after the survey, or flaws in the likely-voter model. Treat it as one part of a poll’s uncertainty, not a guarantee that the true result falls within a fixed range.
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For context, AAPOR’s 2021 report on 2020 pre-election polling found an average margin of error of 3.9 points among the state-level presidential polls it examined. In that specific analysis, candidate margins smaller than 7.8 points were difficult to distinguish from zero using conventional significance levels. Those historical figures describe that poll set; they are not a rule for other polls or an estimate for a current race (AAPOR’s 2021 report).
What election results tell you—and when they are final
Election results report votes counted for a particular contest. Totals reported on election night are preliminary: eligible ballots may still be arriving or awaiting counting, and officials continue administrative checks. The U.S. Election Assistance Commission (EAC) states that “the election results reported on election night are never the final, certified results” (EAC, Election Results, Canvass, and Certification).
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From election-night returns to certification
After voting, election officials canvass the returns: they reconcile ballots and records and complete other required checks. Audits may also take place. Officials then certify the result under the applicable state and local procedures. The details and timelines vary by jurisdiction, so the relevant state or local election office is the authority for a live contest’s status.
A “100% precincts reporting” label does not, by itself, mean that officials have certified the result. A media organization may project a winner while the official process continues; a projection is not an official result. The EAC says only election officials provide official election results.
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A poll and a result measure different things: one estimates responses from a sample before Election Day, while the other counts ballots cast. A gap between them does not, on its own, show that a poll was inaccurate. Opinion may have shifted after the poll’s field dates; the poll’s sampled population may differ from the people who voted; or sampling, recruitment, nonresponse, weighting, and turnout-model choices may have affected the estimate. Election-night totals may also change as eligible ballots are counted and returns are reconciled.
AAPOR notes that assembling final vote tallies can take weeks, and a thorough understanding of the factors affecting major-election polling can take many months. Avoid evaluating a poll against partial election-night data (AAPOR, Polling Accuracy; AAPOR’s 2021 report).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare a poll with the vote fairly
Compare like with like: use the same contest and geography, and use final certified vote totals when they are available. A poll percentage is an estimate; compare the poll’s candidate margin with the corresponding vote margin rather than treating the percentage as a ballot count.
- Timing: Check the poll’s field dates and how close they were to Election Day.
- Population: Determine whether it surveyed all adults, registered voters, or likely voters. These groups are not interchangeable.
- Contest and geography: Confirm that the poll covers the same candidates and geographic area as the results.
- Recruitment and sampling: Look at who sponsored the poll and how respondents were reached or recruited.
- Survey mode: Note how interviews were conducted; different modes can produce different results.
- Weighting and turnout model: Check how the poll adjusted its sample and estimated who would vote.
- Uncertainty: Read what the reported margin of error covers, and remember that subgroup estimates generally have more uncertainty than full-sample estimates.
- Result status: Distinguish a poll estimate from unofficial returns, a media projection, and a certified total.
AAPOR’s guidance for journalists and 2024 poll-consumer guidance offer additional context for evaluating polls. For official totals, consult the election office responsible for the contest.
What to conclude when a poll lead is close
If a poll shows a narrow lead, treat it as an estimate that may not establish which candidate is ahead, particularly when the margin is small relative to the poll’s sampling uncertainty. Do not read it as a prediction of the final count. Wait for the official canvass and certification before treating vote totals as final.
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