… When polls closed in New York on Tuesday, exit poll estimates showed Bernie Sanders trailing Hillary Clinton by only four points. That eventually got adjusted, but it was the most recent example of a poll showing a number that ended up being way off the final result.
To figure out why, I reached out to Joe Lenski, executive vice president of Edison Media Research. …
To explain what happened in New York, it’s best to start at the beginning: How exit polls work, from start to finish. CONT.
Philip Bump, Washington Post