WASHINGTON (AP) -- The Senate's No. 2 Democrat on Friday asked the Justice Department to investigate whether the CIA obstructed justice by destroying videotapes that documented the harsh 2002 interrogations of two alleged terrorists. A day after CIA Director Gen. Michael Hayden told agency employees the tapes were destroyed in 2005, members of Congress, human rights groups and lawyers for accused terrorists said the tapes may have been key evidence that the U.S. government had illegally authorized torture. In a letter to Attorney General Michael Mukasey, Senate Democratic Whip Dick Durbin of Illinois asked for a probe of "whether CIA...