Same day registration might permit somebody to vote in both Wisconsin and Michigan.
There is, already, thousands who vote in Michigan and Florida.
One or both by absentee.
That is already happening it’s not a huge problem but should be stopped, here in Florida we’ve had cases of someone voting in New York, flying to Florida and voting again, if they own property in both states
Same day registration might permit somebody to vote in both Wisconsin and Michigan.
Maine has allowed same day registration for a very long time. The only registration problems I see in Maine relate to other parts of the process.