I can't confirm that (al Qaeda's responsibility for the attack) nor can we confirm the authenticity of the tape, but assuming that it is him, his message contains the same hollow justifications for the mass slaughter of innocents that we've heard before," David Axelrod said on CNN's "State of the Union" program. The audiotape that aired on Al Jazeera television on Sunday claimed responsibility for the attempted Christmas Day bombing of the Detroit-bound plane. A Nigerian, Umar Farouk Abdulmutallab, has been