Sam McPhail Sam McPhail

How accurate are the US election polls?

Voters line up to cast their ballots in Atlanta, Georgia (Credit: Getty images)

Is Donald Trump going to lose Iowa? That’s the conclusion many US pundits came to after a bombshell poll over the weekend. That poll, conducted by the psephologist Ann Selzer, put Kamala Harris three points ahead of Trump in Iowa, despite Trump having comfortably won the state by almost ten points in the past two presidential elections.

So Iowa could tonight return to swing state status. In past elections voters in the state have backed Reagan, Clinton, Obama, and Trump: now they might turn to Harris. However, at the same time as the Selzer poll was published, a contradictory but less-covered poll indicated another strong Trump victory. This poll from Emerson College concluded that Trump is still ten points ahead of Harris. Once again, US pollsters have been left scratching their heads. How could two polls just two days apart with the same sample size in the same state be so different?

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