ID is only necessary if you haven't already established the right to vote in a particular location. After that, you're on the list and it's remarkably difficult

ID is only necessary if you haven't already established the right to vote in a particular location. After that, you're on the list and it's remarkably difficult to get you off of it; as it should be. ID requirements are frequently used in order to deny voting to people who are poor or otherwise find it difficult to get particular documents.