From Allan Smith writing at Business Insider:

Brash billionaire Mark Cuban argued on Wednesday that polls would not be a good indicator of the 2016 election outcome.

“This election will be determined by the battle of science vs anger,” the owner of the NBA’s Dallas Mavericks and star of ABC’s “Shark Tank” tweeted. “Ground game vs the draw of the angry voter. Polls won’t tell the story.”

Trump, the Republican nominee, has watched as his standing in national polls, as well as in crucial swing states, has crumbled after a series of missteps following the Democratic National Convention in late July.