No they didn't. Pollsters don't poll electors. They poll people. They poll the popular vote. The national polls got the popular vote almost exactly right.
NO shit, genius. They over-sampled democrats to get their numbers.
It's an old political trick before the election meant to discourage opposition voters to the point they believe it is pointless to go vote, believing there is no way their candidate can win.
Like rigging their Primary and feeding debate questions in advance to Hillary, this was a dirty attempt to steal the election.
It failed - Hillary lost.