Donald Trump’s surprise victory in the U.S. presidential election four years ago was a catastrophic blow to the reliability of opinion polls. As November 3 approaches, journalists – and the public – ponder a crucial question: “Can the polls be trusted this time?” A Washington Post headline pinpointed why so many voters are feeling a sense of dread: “Biden leads Trump. So did Hillary Clinton. For Democrats, it’s a worrisome campaign déjà vu.” While national polling shows Bide...
