Nate Cohn: “In national surveys since last November’s midterm election, different pollsters have shown him with anywhere between 25 percent and 55 percent of the vote in a multicandidate field. That’s right: a mere 30-point gap.”
“Whether Mr. Trump is at 25 percent or 55 percent is no small matter. Believe it or not, early polling is fairly predictive of the eventual outcome in presidential primaries. It also has real-world consequences. It affects the decision-making of potential candidates, operatives and activists, many of whom have adopted a wait-and-see approach in part because there are so many conflicting signs of Mr. Trump’s strength.”
“And the existence of such a wide split betrays that the survey research industry may be in far worse shape than one might have otherwise guessed. While the exact reason for the vast spread in survey results is hard to ascertain, the likeliest explanation is that many well-known pollsters are collecting profoundly unrepresentative data.”
