I don't think trump or his people know about this (including Manafort) but there's likely enough for Hillary to hit him on it and really scare people that he'll go soft on Russia.
I think that scares people in suburbia more than emails getting hacked (she looks like a victim).
yeah, let me get this out there, i have little doubt that Trump knows about this. I would think its entirely more plausible that Putin sees Trump as favorable, and is tampering with the election on his own.