Originally Posted by Literature
I think you are conflating two different things: 1) voting and 2) registering to vote.
As you just acknowledged, you don't need a photo ID to register to vote. You fill out a form provided by the state and mail it in. You need to write either your driver's license or the last four digits of your SS on the form and swear that you are able to vote.
Funny, because here is a copy of the first registration by mail from I found when searching google. It is from Wisconsin.
Notice anything? Oh, the spot to check for "i don't have a license or ssn.".