How did I get on the ACLU mailing list?

I got this invitation to become a card-carrying member of the ACLU via snail-mail today:

The President, Executive Director and Board of Directors of the American Civil Liberties Union are honored to invite Lee P. to full-vested Membership in the American Civil Liberties Union with all the rights and privileges of Membership.

If the ACLU would stand up for the actual Constitution from time to time, as opposed to an emanated and penumbrated version of it that has no basis in the American legal tradition, I might consider the offer. As things stand at the moment, however, I must respectfully decline. Thanks.