Multiple interesting things here.
First, Assange is not a fan of Trump or the GOP, but he assumes if they win, they will be checked by the media, which is quite true (checked or be an opposition force). Whereas if Hillary wins, she will not be checked. That’s why he’s not in favor of her winning, in addition to her being a “bright, well-connected sadistic sociopath.”
What’s also interesting in this is that the GRU agents pretend to be other people in trying to get WikiLeaks to take their information, according to this. That would suggest that WikiLeaks, always assumed by some to be connected to Russia, is less-connected than one might have thought.