The same crowd also appear to be the ones worried about voter fraud, so they're consistency has limits.
Look, when the ACLU is against national IDs you have to at least admit that the idea is worth discussing. https://www.aclu.org/other/5-problems-national-id-cards
They represent both the best (a strong belief in an ideal of humanity, and a fervent desire to make the world a fair and open place) and the worst (ideological purity über alles) of the left.
And I say that as a card-carrying ACLU member :)