Obama Claims Historic Victory, Clinton Holds On, McCain Takes Aim

Barack Obama made history last night after the final two primaries of the season, becoming the first African American to be a major party's nominee for president. He now has more than the 2,118 delegates needed to win the Democratic nomination. But his opponent Hillary Clinton showed no signs of backing down last night, prompting speculation among pundits about whether she is pushing too hard for the vice presidential slot. What is at stake for Democrats as Obama reaches out to Clinton and her eighteen million supporters? What kind of general election campaign is ahead for a young visionary senator versus more experienced war hero John McCain?