Can the national election really be hacked? Anything is possible, but the likelihood of votes being changed is far lower than other methods of thwarting a fair and complete vote? Attackers have lower-risk, lower-cost ways to influence the outcome of an election than trying to rewire voting machines to change votes. Physical security of voting machines is very tight and the machines are protected with tamper-detecting seals. Physical access to a voting machine is usually needed to compromise it, but from the practical perspective of an attacker, the number of machines and types of machines would be prohibitive.”]
Source: https://www.darkreading.com/attacks-breaches/hacking-voting-systems-a-reality-check