How did the pollsters get both Brexit and POTUS votes so wrong?

For me it's pretty simple. Group think. When no one you've ever met or hang out with is pro Brexit or pro Trump your poll is going to ignore or, at least, alienate those folks.

Hats off to Rich for seeing thru the fog. Extremely difficult to stand on a hill yelling, "The king has no clothes" while the masses are gathered around commenting on what a beautiful (birthday) suit the king is wearing!!!
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"Government does not solve problems; it subsidizes them." Ronald Reagan

"The trouble with Socialism is that you eventually run out of other people's money." Margaret Thatcher.

"How fortunate for governments that the people they administer don't think." Adolf Hitler