Who says they do not register themselves? You just need a SSN to that matches with a name to register which is not difficult to obtain. In alot of cases, illegals already have SSNs.
Also, your first sentence seems to be a deliberate misrepresentation as I have already clarified twice, although I should not need to as it is common knowledge that both parties send out buses to cart people to the elections.
Also, since you are piping up as well, let me ask you the same question I asked Jnnn:
Hypothetically, if you could provide picture IDs for all citizens, would you still be against a law mandating that all voters present their picture IDs to vote?