Nate Cohn: “Mr. Trump was at 31 percent in the final polls, but finished with just 24 percent. In our data set of early primary polls from New Hampshire and Iowa since 2004, no candidate underperformed the final surveys by as much as Mr. Trump. Mrs. Clinton, for instance, mainly beat Mr. Obama by outperforming her polling, not because Mr. Obama fell short.”
“It’s always hard to figure out why polls are wrong, but this time the stakes are higher. Republican strategists have hoped for months that Mr. Trump’s lead was an illusion. The results in Iowa at least raise the possibility that they’re right — which would call into question Mr. Trump’s advantage elsewhere.”
“This time there is evidence to support one of two possibilities for why polls overestimated Mr. Trump: Voters broke strongly against Mr. Trump in the final days or the electorate was more conservative and more religious than polls anticipated.”
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