Sen. John McCain, the Arizona Republican who was a prisoner of war in North Vietnam for five and a half years, has rejected the argument that torture was necessary to successfully combat terrorism - and denied claims that waterboarding detainees provided intelligence that helped end the manhunt for Osama bin Laden. (snip) On CBS' "The Early Show" Friday, McCain denied claims made by Rep. Peter King, the Republican chairman of the House Homeland Security Committee, who said earlier this week that through the use of such tactics, a courier for the al Qaeda leader was identified. (snip) "Through normal, conventional...