This especially matters in Michigan with straight-ticket vote.
Trump voter comes in, marks straight-ticket Republican vote. Voting machine marks Biden under President -- that is not an invalid vote. It means all Republican except for President, that's how straight-ticket vote works in MI you can mark it and also vote individual measures.
In PA and most others the machine could just fill in Biden on the smaller number of ballots that left the President blank, but that's still thousands of votes probably.
In all states using these machines the votes must be hand counted AND specifically inspected for printed ovals. I'm sure the machine normally completely fills in the oval, but a hacked machine could print ink-pen like patterns that would look normal at a glance.
This especially matters in Michigan with straight-ticket vote.
Trump voter comes in, marks straight-ticket Republican vote. Voting machine marks Biden under President -- that is not an invalid vote. It means all Republican except for President, that's how straight-ticket vote works in MI you can mark it and also vote individual measures.
In PA and most others the machine could just fill in Biden on the smaller number of ballots that left the President blank, but that's still thousands of votes probably.
In all states using these machines the votes must be hand counted AND specifically inspected for printed ovals. I'm sure the machine normally completely fills in the oval, but a hacked machine could print ink-pen like patterns that would look normal at a glance.