Barack Obama elected US President

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U.S. Republican presidential nominee Senator John McCain (R-AZ) speaks during his election night rally in Phoenix, November 4, 2008.REUTERS/Mike Blake

While addressing supporters in Phoenix, Arizona, his home state, John McCain conceded defeat and congratulated Obama on his victory.

John McCain, Republican Presidential Candidate, said, "The American people have spoken, and spoken clearly. It's natural tonight to feel some disappointment but tomorrow we must move beyond it and get our country moving."

Obama is scheduled to be sworn in next January.

For him, the president-elect may face an array of challenges over the next four years, including the economic crisis, the wars in Iraq and Afghanistan, a potential healthcare overhaul and many others.

Obama has called on Americans to back a spirit of unity to handle the pressing issues facing the country.

Editor:Zhang Pengfei