It’s tough to work against bus loads of illegal voters that roar into NH every election day.
2016 proved this with the Senate and Presidential race. We got lucky with the Governor’s race.
If we can’t get rid of Same Day Registration there will never be a “fair” election in the state.
You can observe the check-ins and see who votes - and if you want write down their name and address.
Voting registration lists are available in every Town Hall and they are public documents. You can look at them and see the names and addresses of everyone who voted, including the new registrants once the list is updated.
If there are people voting illegally it is possible to determine that by careful observation and research. A list of actual cases of illegal voting, with real evidence would lead to prosecutions, or at least real, significant reform.
No evidence of illegal voting would be just as valuable.
Same day voter registration prevents the use of provisional ballots, a source of fraud in other states.