The tricky thing with polls is that as long as they stay within the MOE, they can argue they were still accurate. So they can spin it like someone has momentum even if it's a 1-2 point movement, which is really very minor. But the public's tendency to overreact to even the littlest movements can be weaponized against them.

My guess is that pollsters are very confident the election will be fairly close, so even if they spin it like one candidate has had the advantage for a while and it turns out the other candidate wins, as long as they stay within that MOE, they can say they weren't wrong at all.