this is how illegals can vote in California without ID. The polling places are required to post the list of voters, updated hourly, with the names and addresses of who voted (and who didn't). One can look at the list, pick a name and address, enter the polling place, and vote as that person.
http://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?lawCode=ELEC&division=14.&title=&part=&chapter=3.&article=4.