I don't recall George W. Bush ever actually promising to stay out of wars and interventions. It's been standard for the two parties to criticize each-other on grounds of doing interventionism badly or going too far towards one extreme regarding foreign policy, but nobody has run as a real pacifist or isolationist because they would lose in a landslide. It especially doesn't help that pacifism and isolationism are associated with activist fringes in both parties who often lean into crank theories or make friends publicly with adversarial states.