Problems with political polls

- Polls had Republican frontrunner Donald Trump winning in Iowa. Instead Texas Sen. Ted Cruz took the top spot. Republican Sen. Marco Rubio's strong third place showing also surprised pollsters.

Hillary Clinton, pollsters predicted, would beat her Democratic competitors. She did, but her victory was supposed be by a wider margin. Instead, it was a virtual tie with Bernie Sanders.

So what happened? How did pollsters get it so wrong?

David Birdsell is a political analyst and a professor at Baruch College. He says there are about 60,000 reasons pollsters were wrong about the race Iowa. That's how many more Republicans showed up to caucus than the pollsters expected.

It's not just the number of people that can throw things off but something intangible: a mood, an energy in the electorate pollsters underestimate.

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