US Democratic presidential candidate Illinois Senator Barack Obama and his wife Michelle arrive at Chicago Midway airport on June 03 2008. Obama was poised to make history by becoming America’s first black presidential nominee, as a flow of Democratic Party support thrust his rival Hillary Clinton towards defeat. Democratic officials or superdelegates leapt onto 46-year-old Obama’s bandwagon, as Montana and South Dakota closed out a rancorous, coast-to-coast presidential nominating marathon, which has split the party’s support in two. AFP PHOTO/Emmanuel DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)