I believe that is why Trump has generally outperformed the polls (as long as we’re not talking about insider caucuses), and that in turn may have contributed to his underestimating the value of analytics and a well-organized ground game. (That is, not realizing that such could add still more to his overperformance of polling and end up being the margin he’ll need for ultimate victory.)
Now the Brit’s have to do some additional house cleaning.......Muslimes. Make England Great Again!