I do believe that statistics can give one a "approximate temperature" with the accuracy of say, the weather guy. Even Harry Wappler was wrong once in awhile.
People are tweaking polls as we speak...lol

That said, you can't predict the future. Like Russia helping you win an election. All predicted Hillary was a sinch. Russia tilted the scale in Drumpfs favor, Hillary loses. How many that predicted Hillary would change their decision with the inclusion of Russian/Drumpf colluding to fix the vote? I bet the majority if not all. So in fact, the folks who predicted Hillary were right, and so was the Russian, I mean American voters. JMO

Frank Luntz is pretty good at "modern polling". As technology advances, methods are tweaked. I hate him...lol...He's really good at what he does.

https://en.wikipedia.org/wiki/Frank_Luntz