I don't quite understand abut the voting machines.
According to Time in April 2016
time.com/4305508/paper-ballot-history/
"Only five states (Delaware, Georgia, Louisiana, New Jersey, South Carolina) have paper-free voting and some states (Colorado, Oregon, and Washington) send all constituents a paper ballot in the mail."
Why are machines needed, if so many states don't use them or don't use them exclusively? Living in England I had got the impression that the USA used nothing but computerised voting, but that article says I was completely wrong.