Doesn't this violate their "non partisan" tax exempt status?
The ad (which amazingly I can't find on online):
"Will Senator Joe Lieberman pass this test on American values?” the ad asks. It features Mr. Lieberman’s photograph and office telephone number, along with warnings about pending legislation about detainees, torture, and wiretapping. “Tell Joe Lieberman his votes on this assault on American values will help determine your vote in November,” the ad says." (source)
It seems this is causing yet another riff in the structure of the ACLU -Stop the ACLU has the whole story.
I did find this though...just look at how creative the far left is. I wish I was that witty... (There is no way you will make it through the whole thing)