The rat ground game has one advantage -- their base is concentrated in urban areas and they bus in... logistically much simpler. Look at the county by county map ... rats win relatively few counties but they are all high density urban areas.
Ah, but that is why Trump’s black support is key. Think about it. If he really peels 20 or 30% of blacks from the Rats they won’t be able to play games in those precincts. And these are people who will have CHANGED PARTIES. Not likely to be lackadaisical. Probably not real interested in allowing the chicanery that they know goes on.