I was only challenging your use of a poll. Which, BTW, you used incorrectly... trying to contort an argument out of it that simply was not there.
The fact is, if you understood polls, particularly the difference between an election poll and an opinion poll, you would find that polls are remarkably spot on. Why do you think campaigns spend a very large part of their campaign budget commissioning polls and focus groups?
I don't think RealClearPolitics engaged in such predictions or forecasts. It is an aggregator of political news with some commentary.
Per RCP
"....The accuracy of the RCP Poll Average is unmatched and trusted for use in Bloomberg terminals and campaign communication documents, as well as being widely cited by hundreds of news organizations including The Wall Street Journal, New York Times, Financial Times, FOX News, CNN, USA Today, and MSNBC...."
https://www.realclearpolitics.com/about.html
If you will remember, the aggregate of polls had Clinton winning nationally by 3%...she won by 2%, which in the polling world means they were spot on.
https://www.realclearpolitics.com/elections/2016/
This article, which appeared the day of the election, commented up the last minute swing in Trump polling, suggesting it could be consequential. If you saw this prediction there, it likely was from another source.
https://www.realclearpolitics.com/a...inton_trump_stand_on_election_eve_132270.html
Fivethirtyeight had a Clinton win probability of 64%. If someone with a 36% win probability wins, its a minor upset, not an unforeseen event. If the weatherman says there is a 30% chance of rain and it rains, was he wrong? I don't think so.