Nate Silver team's final prediction for US election: 'Polls are close, results might not be'

"...However, that doesn't mean the actual outcome will be all that close. If the polls are totally accurate we're in for a nail-biter on Tuesday night. But a systematic polling error is always possible, perhaps especially if you think pollsters are herding -- only publishing results that match the consensus. And because things are so close, even an average polling error would upend the state of the race," Silver Bulletin's latest poll said.