Obama trounced his Democratic rival, taking 61 percent of the vote to Clinton's 37 percent. Exit polls showed that about 90 percent of African-Americans backed Obama, who is trying to become America's first black president. The victory in Mississippi extended Obama's lead over Hillary Clinton in pledged delegates to the August nominating convention. The next big showdown is in Pennsylvania in six weeks time. With 158 delegates at stake, it's the biggest single-state haul remaining in the race for the nomination. Obama trounced his Democratic rival, taking 61 percent of the vote to Clinton's 37 percent. Exit polls showed that about 90 percent of African-Americans backed Obama, who is trying to become America's first black president. The victory in Mississippi extended Obama's lead over Hillary Clinton in pledged delegates to the August nominating convention. The next big showdown is in Pennsylvania in six weeks time. With 158 delegates at stake, it's the biggest single-state haul remaining in the race for the nomination.
