PRESIDENTIAL NEWS OF THE DAY: GRAPEVINE, Texas (Reuters) - President Bush, following the deadliest roadside bomb attack on U.S. forces in Iraq, said on Wednesday the best way to honor the dead was to fight the [terrorists] and train Iraqi troops, and he rejected any early U.S. pullout. "We're at war. We're facing an enemy that is ruthless. If we put out a timetable, the enemy would adjust their tactics," he said in a speech in Grapevine, a Dallas suburb. Those killed in Iraq and Afghanistan, he said, "have died in a noble cause and a selfless cause." "Their families...