- The number of total votes by email may not be greater than the margin anyway
- In-person voting also has basically no authentication, and there's been little to no voter fraud incidents
- To commit large scale fraud you'd need to identify a large list of people who definitely are registered and didn't vote in person. You'd then need to request ballots and respond for each person individually. Shouldn't it be very easy to spot a pattern, were someone to attempt this?
My biggest concern would be that it unfairly favors some demographic more than another (which the OP brings up). But that's still better than disenfranchising everyone.
To be honest, I'm fairly impressed with the reaction time and the lack of technophobia on the part of the NJ govt. Its a simple solution that does a lot of good.