This will be brief...
I have long wanted to do it, but today I finally did it. The action that caused me to finally take the plunge is their lawsuit against the NSA spying scandal (and yes I believe it actually rises to that level - it's certainly scandalous). I won't rewrite the excellent blog post put up by Joan McCarter, but will simply add that since I cannot sue to stop this action, I will support the group that is. My father used to proudly proclaim he was a "card carrying member of the ACLU" back when that phrase was being used to denigrate us liberals/progressives. Now I can say it too and I have on Facebook and now here.
You want to make a difference and not simply rant at fellow DK bloggers/readers, join the ACLU.