Many electronic voting machine does both the "voting
selection" and "vote casting".
Securing voting machines is hard.
Thus we really should be separating the function of "voting"
and "casting" to two separate mechanism, joined only by a
carefully scrutinized API/interface (e.g. inputting
your
preference via NFC/QR/Smartcard ).
By keeping the mechanism of user vote selection outside of
the actual vote casting mechanism itself. It would give the
opportunity to do some pretty funky stuff, like a vote
suggestion app. To which you can download a 3rd party
app, that may ask you a bunch of questions before giving
you a recommended voting setting. If you don't trust that
app, you can download a different one.