Depends on the system, but Maricopa County used this machine in 2016, where a polling place official only sees a tally at the end: https://www.verifiedvoting.or

Depends on the system, but Maricopa County used this machine in 2016, where a polling place official only sees a tally at the end: https://www.verifiedvoting.org/resources/voting-equipment/sequoia/optech-insight/ https://www.verifiedvoting.org/resources/voting-equipment/se... Your idea is feasible if you can break into a warehouse and hack hundreds of these machines, but do you think it's possible to change ~150,000 votes, resulting in a a 10 point swing from recent polls and exit polls, and remain undetected? Remember you're in a big city with lots of news organizations and big elections departments.