Donald Trump is likely to be the first Republican presidential candidate to win the popular vote in the last 20 years. Pre-election polls have consistently underestimated his support since he first ran eight years ago. That's left some folks spending the last week trying to figure out what happened. Geoff Bennett and NPR's Domenico Montanaro discussed what the polls got right and what they missed. PBS News is supported by - https://www.pbs.org/newshour/about/funders