What's at stake here is far greater than a bureaucratic turf battle. The CIA exists to provide pure and unbiased intelligence to its chief customer, the president. George W. Bush, whose knowledge of world affairs is limited at best, probably depends more heavily than most presidents on what his aides tell him about the outside world. And there is mounting evidence that the decision to go to war is based on intelligence of doubtful veracity, which has been cooked by Pentagon hawks.