The rest of the article is about how people's estimates of polls diverge from those same polls, but not why. Were people better at estimating polls or national sentiment thirty years ago?
Pollsters realized that polls can impact the result of a election, people who lean for a particular candidate can be pushed over the edge with a poll that shows that candidate winning.
Half the country has been classified as deplorable and have learned to not express how they feel to others, it shows up at the ballot box but you don't see it when you survey.
Does it really? Last Republican President to win the popular vote was 30 years ago. Longer than I’ve been alive…