Here's how a poll of 1,000 people represents the entire country

Polls got pilloried after 2016 for not seeing a Trump presidency. But scientific polling is not easy. A step inside a Florida polling center shows why. Subscribe to The Washington Post on YouTube: http://bit.ly/2qiJ4dy

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(Source: Washington Post, https://www.youtube.com/watch?v=fNqy2jMMewU)