US Democratic presidential candidate Senator Barack Obama (D-IL) waves to the audience as his wife Michelle (R) claps, at his South Dakota and Montana presidential primary election night rally in St. Paul, Minnesota June 3, 2008. (Xinhua/Reuters Photo)
US Senator Barack Obama clinched the Democratic presidential nomination Tuesday night, becoming the first African American presidential nominee of a major US party in history.
Based on the latest tally of all US media organizations, Obama now has passed the threshold of 2,118 national convention delegates needed to clinch this year's Democratic nomination.
