- The polls missed by just about the historic average (this year as well as four years ago) - Someone running (and selling) a poll has far greater incentives t

- The polls missed by just about the historic average (this year as well as four years ago) - Someone running (and selling) a poll has far greater incentives to be better than everybody else than whatever use they would personally get out of some minor increase in one party's chances - I have no idea why you believe erring in the Democrat's favour would benefit them at the polls. The one theme I remember is Dems trying to lower expectations, because they were afraid people would be so certain, they wouldn't show up