This information lets us look up your voter registration. Without it, we can't help you verify if you are registered, and we can't count you toward the voting bloc. We will help every person who signs up get registered, do not worry.
I have made this field optional, but without it, we can't look up your registration, and you won't count toward the voting bloc. Let us know if you want to verify in person, instead. We do not share this information with anybody at all.