[akkat]

according to your link > No ID required to vote at ballot box: California, Illinois, Iowa, Maine, Maryland, Massachusetts, Minnesota, Nebraska, Nevada, New Jersey, New Mexico, New York, North Carolina, Oregon, Pennsylvania, Vermont, West Virginia, Wyoming, and Washington, D.C.

[sohkamyung]

That's the top level view. A deep dig in the "Laws by state" section shows that some form of ID is still needed.

For example:

Maine: No ID needed at polling place if registered to vote at least one day prior to election. However an ID is required to vote if person was registered to vote on the day of the election

Massachusetts: Non-photographic ID is accepted at polling stations.

Minnesota: Non-photographic ID is accepted at polling stations.

Some of those states are also getting legislation requiring ID for voting.

[akkat]

Maine's law is pretty weak. All one has to do is register more than a day before the election and then they don't need an ID. I don't know how easy it is to register in Maine, but California is laughably easy. Just check the boxes saying that you don't have an ID, SSN, address or phone number, and then you can register with very little information.