If the state has no registraion deadline. Most of states have the registration deadline, if you haven't register before the deadline, you are not allow to vote.
The execption is that you claimed you registered before the deadline but not recieve the notification. The polling place will give the provisional ballot for you to use to vote. Provisional ballots won't be count unless the result is very tight and the provisional ballots can decide the result of the election.
Then they need go to the provisional ballots and make sure whether they legit or not before those votes can be counted.
如果系统里有你的选民登记信息，并且和你本人相符，选务工作人员会给你
一张printed Receipt,上面有你的姓名，地址，选民政号，选区号，凭这个receipt
去下面一个机器提取你的选票ballot，另一个工作人员会再核对你的姓名和出生年月日，
然后你才可以拿到自己的选票。
接着你可以去写票区写票，写完会给引导到另一个机器前面将选票逐张扫入，机器屏幕会告诉你
是否填写合格。开票以手工开票为主，但会和机器读票相对。ballot箱一满，就会全封闭，要等全部
投票完才开箱。
如果没有I D一样可以投票，只要有你的registration信息，但这个票只能是
provisional ballot，也就是
不计入voter roll， verification pending， 当然你也可以选择今天不投，改天再去。
今天反复核对这个过程，觉得作弊很难，取选票机器边上还有专人核对，更有挂牌的第三者监视，
原则就是一人一票，而且必须是registered voter，必须证明是本人。
而且核对过程是两次。
填表啥也不要。
漏洞实在大。
Most of states have the registration deadline, if you haven't register
before the deadline, you are not allow to vote.
The execption is that you claimed you registered before the deadline but not recieve the notification. The polling place will give the provisional
ballot for you to use to vote. Provisional ballots won't be count unless the result is very tight and the provisional ballots can decide the result of
the election.
Then they need go to the provisional ballots and make sure whether they
legit or not before those votes can be counted.
你可以看看加州网站，需要提供什么才能办到选民证。
ID law.