There are a few places, and not many in the swing states, there are a few places where they have been notorious for stealing votes: Pennsylvania, Chicago, places where a lot of cheating have gone on over the years.
There are very few situations where Republicans cheat. They don't control the inner cities the way Democrats do. Maybe if Republicans controlled the inner cities they would cheat as much as Democrats.
In America, we do cheat. We have people who cheat in elections.