Good article by Mark Penn who runs the Harvard-Harris Poll. Penn is a Clinton Democrat and basically writes an unusual column by a Dem that uses actual facts. There is going to be a shake-up in the Senate. People like McCaskill and Donnelly are going to lose. Yet there will still be dumfounded media claiming "muh polling" shows Trump's approval in in 30s.
The whole thing is worth a read. It's not long
"Why the polls are still wrong"
The polls that failed to detect the full strength of President Trump on Election Day continue to underestimate the president’s support for the job he is doing, paying way too much attention to the Twitter wars and ignoring the public support for many of the actions is undertaking.
This can create some serious misjudgments by organizations like the NFL and some Republican senators, who find out later that they buck the president only to their own detriment. And nothing was more devastating to Democrats than believing the election was over when it wasn’t.
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When it comes to rank-and-file Republican voters, Trump is the undisputed leader of the Republican Party. No poll I’ve seen puts his support from Republicans at below 80 percent and we at Harvard-Harris have it at 84 percent, which is remarkable, given his knock-down-drag-out fight with some mainstream Republicans.
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It is by watching the underlying public sentiment of what he is doing, and not his methods, that you see how polling better watch out here, as reality versus research will again be tested, and reality always wins.
http://thehill.com/opinion/white-house/355066-why-the-polls-are-still-wrong