Senator McCain of Arizona is emerging as an early favorite for the Republican presidential nomination in 2008 as a result of a shift in the issues dominating the American political landscape, according to political analysts.Intensifying public concern about the war in Iraq, the prospect of protracted corruption trials in Washington, and renewed qualms among Republicans about federal spending are all putting wind into Mr. McCain's sails while setting back most of the senator's rivals for the nomination."If Iraq and foreign policy and national security and deficit spending are important issues, that will benefit people like McCain," the publisher of a...