Ignorance is bliss, but since you asked ... Democratic Underground.
You might want to check them out someday, but I wouldn't suggest today. And make sure not to give them too many hits.
Oh, they stand for the destruction of America, the belittlement of life, the growth of anything "progressive", the failure of the economy when a Republican is in office, the obstruction of any policy, appointment or bill of any Republican, etc.
Or did you mean the abbreviation? ;^)