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美国民主党总统候选人奥巴马在美国总统选举中击败共和党对手约翰·麦凯恩,当选为第56届美国总统。他将成为美国历史上首位非洲裔总统。
US Democratic presidential candidate Barack Obama defeated Republican rival John McCain in the U.S. presidential election and was elected as the 56th U.S. president. He will be the first African American president in history.