I tend to agree with Rush Limbaugh on this.
Pollsters are subject to political group-think, and polls are also overtly used for pushing the narrative to the gullible among us. On the other hand, more serious pollsters don’t want to be too “wrong” in their ultimate predictions. As such, they will start to “tighten” their polls in the week before election day, to as best they are allowed, represent reality.
Let’s see if that occurs.
I believe this trend has been born out by history. BTW the LA Times polls which have favored Trump were supposedly very close on the Obama / Romney.
On "group think" I would just say there is lots of group think and spin going on on both sides. Trump discounts polls because they show him behind. If they showed him ahead he would be bragging about them like he did during the primaries. One has to ignore a lot of this noise until the final week and we will see if Trump pulls it off or loses to Hillary Clinton, one of the lamest crooks to run for the WH.