For those who don't understand the term "card carrying," it is a slur used to indicate one is a member of some organization which is considered disreputable. Supposedly, the organization issued identification cards to indicate who is a member. Back in the 50s, during the Red Scare days, one could do a great job destroying someone's reputation by saying that they were a "card carrying member" of the Communist Party. Later, you were considered a bleeding-heart liberal if you were a "card carrying member" of the A.C.L.U. (When this latter usage became common, the ACLU had a sense of humor about it, and responded by developing an actual membership card, more for laughs than any other reason.)
