As sometimes happens with Rep. Patrick Kennedy (D-R.I.), he let his mouth race ahead of his brain Wednesday night at a gathering of Young Democrats at the Washington nightspot Acropolis. After presidential candidate Howard Dean spoke, Kennedy delivered an impassioned peroration against President Bush's tax cut. We hear that Kennedy told the crowd: "I don't need Bush's tax cut. I have never worked a fucking day in my life." With that he got the audience's attention -- the dropping-jaws kind. "He droned on and on, frequently mentioning how much better the candidates would sound the more we drank," a witness told us. "Finally, he had to be stopped by a DNC volunteer." Kennedy's spokesman, Ernesto Anguilla, told us yesterday: "He was talking to the crowd; it was a rally-the-troops kind of speech about the tax cut. He was energizing the crowd and got caught up in it and used an unfortunate word, which he regrets using. . . . And no one pulled him off the stage."