Bush has inveted lot of money in Mush,so US won't let him resign,atleast for this year(2008).In nov there will be election in US so fate of Mush future will be in hand of newly elected president ,new president will take charge in Jan 2009.So Mush is safe till Jan 2009.US(Bush) wants this so called war against terrorism on till election in Nov, because there is strong Re-publican lobby in US, who still favors war and Bush will paly race and religion card against democratic candidate Clinton(being female) and Obama(being black and Half Muslim).