If voting machines is connected to Internet via WIFI, the signals can be intercepted by somebody near the voting station or vote counting station. The incoming and outgoing signals can be analyzed. If he has had prior knowledge of the voting system in detail, he may be able to connect the dots.
They would have everything.
It would also justify military intervention once any election information is transmitted outside of the USA. If any data passed outside our borders, it becomes an very difficult situation for the democrats. Perhaps an extinction level event.