Why is this even a question...should have been in place already
With multi-factor authentication remote or smartphone voting is entirely safe - finger print-face scan-iris scan-voice-random password-location etc.
Republicans have always pursued many forms of voter suppression so mail/secure electronic is something they will do their best to avoid
If banking / ss / irs can be secure via smartphone then so can voting!
You can even combine mail & electronic so when both match your vote gets registered