That's not true, there have been countless articles about why polling went wrong last time.
Also, polling wasn't that wrong. Due to sampling bias, several swing states were off by as much as 5-6 percentage points. But national polling bad Hillary winning by something like 4% in the popular vote.
Also, polling wasn't that wrong. Due to sampling bias, several swing states were off by as much as 5-6 percentage points. But national polling bad Hillary winning by something like 4% in the popular vote.
Instead, she won the popular vote by 3%.