In 2024 Trump vs Biden rematch, can we believe US polls?

Right up until the eve of the election, and despite corrective measures taken in the wake of 2016, polls overestimated the Biden vote and underestimated support for Trump.

Trump supporters at a campaign rally in Freeland, Michigan. Photo: AP

The so-called “shy Trump voter” – too timid to express their preference to pollsters – does not explain the discrepancy, as was suggested in 2016 and again in 2020, says Don Levy, director of the Siena College Research Institute, which publishes surveys with The New York Times.

Levy believes that Trump supporters are simply more reluctant to answer pollsters’ questions – likely because for years, the Republican has been telling them that the media are conspiring against him.

“And like it or not … we fall under that same umbrella of fake news, fake media,” he said.

Celinda Lake, whose influential polling company works for the Democratic Party, agrees.

“Donald Trump told his followers not to answer polls, and frankly, we’ve never had to face that before,” she said.

Doug Schwartz, head of the reputable Quinnipiac University Poll, explained that in 2020, “respondents became more guarded in answering” the question of voter preference.

He said Quinnipiac’s efforts had “helped reduce the refusals” in more recent surveys, but did not elaborate.

Such efforts – the methodology behind the polls, and how they seek to correct what is seen as an underrepresentation of Republican voters – are at the heart of their accuracy.

US President Joe Biden salutes from the White House’s Truman Balcony. Photo: AP

The pollsters surveyed by Agence France-Presse agree that reaching voters in the age of smartphones with built-in call screening is increasingly difficult and costly.

Levy, of Siena College, now asks “the horse race question” – Biden or Trump? – up front.

Trump supporters are less likely to complete the survey, but they may at least answer that first question, even if they then hang up, he explained.

His preferred method is the telephone interview, based on voter lists weighted towards potential Trump supporters in the samples – such as rural white voters without a university degree.

Democrat pollster Lake, for her part, said she establishes reservoirs of potential Republican voters using statistical modelling techniques.

She refuses to confine herself to the telephone.

“You’re going to get a sample that’s older, for example, it’s much harder to reach young people,” she explains.

Phone interviews also skew “more upscale,” she added. “You’re going to get people that are working on regular shifts rather than irregular shifts and gig economy.”

Instead, “we call, we go online, and we text, and we call both cell phones and hard lines … We try to reach people multiple times, multiple ways,” she said.

Once they do reach voters, her staff are increasingly careful with how they open their questions, she said.

That means “making sure that our questionnaire does not sound biased or liberal in the beginning.”

So far in 2024, the polls have largely had Trump and Biden neck and neck.

From now until November, pollsters will focus most intensely on the battleground states.

The United States uses the electoral college voting system: rather than relying on the national popular vote, each state holds its own ballot for the next commander-in-chief, and winning candidates are awarded “electors” from all 50 states, a number equal to each state’s congressional delegation.

With candidates needing 270 electors to win the White House, elections tend to be decided in the hotly-contested “swing states”.

This year, those crucial battlegrounds look set to be Arizona, Georgia, Michigan, Nevada, Pennsylvania and Wisconsin.

But casting the spotlight on voters there could do more harm than good, Levy fears.

“Some of those people are going to feel over-polled. And that could have an influence as well,” he said.

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