Well 2 things can be true

"I think the profession did take a wake-up call," he said of the 2016 election.

National polling was accurate — Clinton ultimately won the popular vote — but according to Keeter, polls in states that proved to be pivotal, such as Michigan, Pennsylvania, and Wisconsin, had problems.

Link: https://www.cbsnews.com/news/2016-polls-president-trump-clinton-what-went-wrong/