The 2016 popular vote polling was not even off. Trump did a little better than expected but well within the margin of error. Trump just got the exact breakdown he needed thanks to our antiquated electoral process.
The argument that Trump lost the popular vote is completely irrelevant. For the last 250 years the United States has an electoral college system - every presidential candidate understood and understands those rules and the system at play.
Campaigns are waged on the knowledge that it’s an EC system. If you went to merely a popular vote, campaigns would fight differently thereby making the PV outcome unpredictable within our current context.
In the meantime, I’ll call the Wambuiance for all the hissy fits about not winning a fair election.