You need to verify you identity at time of registration which includes photo Id and other documents to verify where you live. This is all governed at the federal level with the "Help America Vote Act". Why do I need to show an ID at the polls every time i vote? They have my signature on file and can check that but there isn't a problem with people voting with someone's registration.

Voter ID is all about voter suppression, in Texas you don't need an ID to vote if you over 65. Only in person voting in Texas requires ID but you can do mail-in if your over 65.