Can we trust the polls for the US election?
Ask most party strategists, US pollsters or pundits and they’ll tell you the 2024 presidential election could be the closest in decades, if not a century.
Given Joe Biden’s 2020 win was decided by fewer than 45,000 votes in just three battleground states, that’s quite the claim.
However, it is what the polls suggest. The contest between Kamala Harris and Donald Trump is super tight, both nationally and in the key states.
So, how much can we trust the polls?
It’s a question many are raising after they famously got it so wrong four years ago.
The American Association for Public Opinion Research called it the biggest polling miss in 40 years, showing Mr Biden’s lead over Mr Trump in the final two weeks of the campaign twice as large as it was when the votes were counted.
In 2012, pollsters significantly under-estimated Barack Obama’s lead over Mitt Romney. But, while Mr Trump’s 2016 victory over Hillary Clinton shocked many people, the error on the national polls was relatively small by comparison.
Of course, all polls come with uncertainty, some inbuilt error, and they are only a snapshot of the current situation, not a prediction of the outcome on polling day.
Crucially, though, there is evidence they also become a more reliable predictor of the outcome the closer we get to the election. It may seem obvious, but a year out from voting the polls are on average seven points different from the final tally for each candidate. By the last week of the campaign, this falls to less than three points.
Every day the polls tell us a little bit more about the result.
So, how should we read them?
One key thing to remember is the uncertainty around the estimated support for the candidates.
Uncertainty: ‘Margin of error’
While pollsters publish a percentage figure for each, they also report a ‘margin of error’ to indicate the amount that support might vary.
For example, if a poll puts Mr Trump on 46% with a three-percentage point margin of error, it means that his support among the voting public should lie between 43% and 49%. If the same poll has Ms Harris on 49%, then her support should lie between 46% and 52%.
All this tells us is that the contest is close and either candidate could be leading.
Similar caution is required when looking at trackers using polling averages.
You might think that averaging the polls would reduce uncertainty, since random errors should cancel out. But some pollsters are consistently more accurate than others, while some may be systematically wrong in one direction. Adding them all together can reinforce those biases.
Read more on the election:
What exactly happens on the night of the US election?
How does Donald Trump keep his support so strong?
Trump in Wisconsin at the start of the month. Pic: AP
Predicting the turnout: Context matters
Who votes in an election is also critical to the outcome but predicting that is a tough ask for pollsters. Roughly a third of eligible Americans do not cast a ballot in presidential elections, and it isn’t all the same people each time.
Context matters. It can make people more or less likely to vote. For example, potential changes to abortion laws seems to have mobilised many Democrats in the 2022 midterm elections.
The policies and performance of a candidate can also change the likelihood of more partisan voters to turnout.
The Electoral College: Why state contests can be crucial
The same considerations are needed when looking at state polls and arguably they are more crucial to determining which candidate is most likely to win the election.
The outcome of a presidential race is decided state by state, by the Electoral College, and the difference between that and the national vote has been growing.
Read more: What is the Electoral College?
Harris discusses abortion rights in Arizona in June. Pic: Reuters/Rebecca Noble
In 2000 and in 2016, the candidate with the most votes nationally lost the election because they didn’t win a combination of states that delivered the highest tally in the Electoral College.
This is why battleground state polls get so much attention and they are factored into the models of statisticians trying to forecast the outcome.
Of course, they have the same uncertainty and potential flaws as national polls. And the bad news is their recent performance hasn’t been great.
In 2016 they suggested Ms Clinton would sweep the key states needed for a comfortable win in the Electoral College. In 2020, they fared even worse.
Some states have proven particularly difficult to poll accurately. In 2016 and 2020, the biggest misses were in Wisconsin, Michigan, North Carolina and Pennsylvania.
These, especially Pennsylvania, which of the group carries the most Electoral College votes, are all potentially decisive in 2024.
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So, what can the polls tell us?
The answer is plenty if you are looking for a steer on how people feel about a certain candidate or policy.
But, if you’re trying to work out who’s ahead in the race to be president, then all you can confidently say is the contest is really close and could come down to a small number of votes in a few states.
Donald Trump has filed a lawsuit against Rupert Murdoch, two Wall Street Journal reporters and the publication’s owner, News Corp.
The US president has accused the named individuals of defamation, claiming they acted with malicious intent and caused him overwhelming financial and reputational harm.
The lawsuit, which was filed in Miami, seeks at least $10bn (£7.5bn) in damages.
In a post on Truth Social, Mr Trump called the lawsuit “historic legal action” which was filed on behalf of himself and all Americans who he said will “no longer tolerate the abusive wrongdoings of the Fake News Media”.
“I hope Rupert and his ‘friends’ are looking forward to the many hours of depositions and testimonies they will have to provide in this case,” he wrote.
It comes after Mr Trump claimed that a letter he allegedly wrote to paedophile Jeffrey Epstein was “fake” and said he would sue the “ass off” Rupert Murdoch, who owns the Wall Street Journal (WSJ), which first published the story.
The publication had said Mr Trump wrote the letter as part of a collection Epstein’s former girlfriend, Ghislaine Maxwell, planned to give him as a 50th birthday present in 2003.
It claimed the message, allegedly from Mr Trump, featured several lines of typewritten text, concluding with: “May every day be another wonderful secret.”
The text was framed by what appeared to be a hand-drawn outline of a naked woman, the WSJ claimed. The letter is also said to have featured the signature “Donald”.
Mr Trump immediately denied writing the letter when the WSJ report was published on Thursday night.
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Memes of Epstein undermine victims, says lawyer
“The Wall Street Journal printed a FAKE letter, supposedly to Epstein,” he wrote on Truth Social.
“These are not my words, not the way I talk. Also, I don’t draw pictures. I told Rupert Murdoch it was a Scam, that he shouldn’t print this Fake Story. But he did, and now I’m going to sue his ass off, and that of his third rate newspaper.”
Mr Trump ignored questions about Epstein as he signed a cryptocurrency bill at the White House earlier on Friday.
The president’s lawsuit comes as the US government filed a motion to unseal grand jury transcripts related to Epstein, who took his own life while awaiting trial in 2019.
In a Manhattan federal court filing, the Department of Justice said the criminal cases against Epstein and Maxwell are a matter of public interest, justifying the release of associated grand jury transcripts.
Earlier on Friday, Mr Trump said attorney general Pam Bondi had been asked to release the transcripts because of “the ridiculous amount of publicity given to Jeffrey Epstein”.
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The justice department previously said it had around 200 documents relating to Epstein and that the FBI had thousands more.
It is unknown how much of this is grand jury testimony, which is typically kept secret under US law.
Read more:
All we know about the ‘friendship’
Trump denies writing birthday letter to Epstein
The president has faced increased scrutiny over his alleged friendship with Epstein since his administration’s U-turn on the so-called ‘Epstein files’.
Mr Trump pledged to release files on Epstein during his presidential campaign, as his MAGA movement accused the Biden administration of suppressing the extent of Epstein’s paedophilia, predatory behaviour and his so-called “client list” – thought to contain names of the rich and famous who conspired with him in his child sex trafficking operation.
But after a review of the evidence the US government has, the Justice Department recently determined that no “further disclosure would be appropriate or warranted”.
Venezuela releases jailed Americans in prisoner swap
The Trump administration said on Friday that it had negotiated an exchange with Venezuela, resulting in the release of 10 jailed Americans.
US secretary of state Marco Rubio said the prisoners, who had been held in the South American country, were “on their way to freedom”.
Men in the CECOT jail in EL Salvador. Pic: Reuters
In return, 252 Venezuelan migrants being held in El Salvador have been freed, the Venezuelan government said.
They had been held in the notorious maximum security CECOT prison after being deported by the US.
US
Trump denies claim he wrote birthday letter to Jeffrey Epstein – and says he has ordered release of more case files
Donald Trump has called an alleged letter he wrote to paedophile Jeffrey Epstein “fake” and said he will sue the “ass off” Rupert Murdoch, who owns the paper that first published the claim.
In multiple posts on Truth Social, the US president accused The Wall Street Journal (WSJ) of fabricating the letter that it claimed was written by Mr Trump as part of a collection of letters addressed to Epstein that his former girlfriend Ghislaine Maxwell planned to give him as a birthday present in 2003.
According to documents seen by the WSJ, Mr Trump’s letter featured several lines of typewritten text framed by what appeared to be a hand-drawn outline of a naked woman.
The paper said the letter concludes “Happy Birthday – and may every day be another wonderful secret”, and featured the signature “Donald”, allegedly drawn across the woman’s waist, meant to mimic the appearance of pubic hair.
Epstein took his own life in prison in 2019. Pic: AP
Responding to the WSJ’s claims, Mr Trump wrote: “The Wall Street Journal printed a FAKE letter, supposedly to Epstein. These are not my words, not the way I talk. Also, I don’t draw pictures.
“I told Rupert Murdoch it was a Scam, that he shouldn’t print this Fake Story. But he did, and now I’m going to sue his ass off, and that of his third rate newspaper. Thank you for your attention to this matter! DJT.”
He said earlier he would also sue the WSJ and News Corp, which Mr Murdoch owns. The WSJ is published by News Corp subsidiary company, Dow Jones & Co.
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From 16 July: Trump: Epstein case is ‘a boring story’
The Justice Department has not responded to the WSJ and the FBI declined to comment.
In a separate post, Mr Trump said he has asked the attorney general, Pam Bondi, to release “any and all pertinent grand jury testimony” in the case of the paedophile financier who was found dead in his Manhattan cell in August 2019, shortly after he was arrested on sex trafficking charges.
The release of any documents, Mr Trump said, would be subject to approval by a court.
The justice department has previously said it had around 200 documents relating to Epstein and that the FBI had thousands more. It is unknown how much of this is grand jury testimony – which is typically kept secret under US law.
Ms Bondi responded to the president on X, writing: “President Trump-we are ready to move the court tomorrow to unseal the grand jury transcripts.”
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Elon Musk, who claimed last month that Mr Trump appears in the Epstein files, was surprisingly among the first to come to the president’s defence over the WSJ claims.
“It really doesn’t sound like something Trump would say tbh,” the tech billionaire wrote on X, before going on to ask where the evidence against Epstein allegedly held by the FBI had gone.
The Trump administration has come under criticism after the president appeared to U-turn on his own promise to release more information about the Epstein case publicly.
In the run-up to the US election last year, Mr Trump drew on rumours and conspiracy theories that appeared to accuse the Biden administration of suppressing the extent of Epstein’s paedophilia, predatory behaviour and his so-called “client list” – thought to contain names of the rich and famous who conspired with him in a child sex trafficking operation.
Ms Bondi fuelled these rumours in February by telling Fox News that the alleged Epstein client list was “sitting on my desk right now to review”.
Read more:
Ghislaine Maxwell could challenge imprisonment
Why is Trump fighting with MAGA over Epstein?
The huge impact of Musk’s row with Trump
Listen to The World with Richard Engel and Yalda Hakim every Wednesday
In the same month, the justice department released some government documents regarding the case, but there were no new revelations.
After a months-long review of additional evidence, the department earlier this month released a video meant to prove that Epstein killed himself, but said no other files related to the case would be made public.
The decision was criticised by many in Mr Trump’s Make America Great Again (MAGA) movement, who Mr Trump later called “weaklings”.
Sky News has contacted the White House for further comment.
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