This is precisely why there MUST be a paper record of electronic voting. If you have electronic voting without a paper record, where the person can see the paper record of his own vote, then you are asking for manipulation of elections by manipulations of the code.
Indeed, given the whole history of electoral corruption in every nation in the world, including the US, whoever believes that you can have voting done into a black box with no paper check on the black box to verify what was input is what was registered, is naive. Who ever argues against having a paper record is either naive, or very intelligent and knows EXACTLY what he is doing.
Electronic voting without paper backup records for verification is guaranteed to be corrupt, manipulated voting. If the Republicans aren't ALREADY manipulating the electronic voting sans backup paper, the Democrats most certainly WILL when they get power, and then you will never see another Republican majority again, because the machine codes will generate the votes necessary to ensure a Democratic win, and the Democratically-controlled government will never allow the issue to be opened to investigation. End of game. And end of democracy.
That is why everyone should assume that whoever wants electronic voting without any paper backup is intending to commit election fraud. Because they are.
"paper record of his own vote,"
That is exactly what I would like implemented. Vote with a secure electronic machine, which would produce one or more numbered written receipts. The voter would take away a receipt. If a particular election was legally protested, the judge could invite voters to bring in their copies for comparsion.