Barack Obama introduced Sen. Joe Biden of Delaware as his running mate, hailing him as a ``leader who is ready to step in and be president.''
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Obama introduces running mate Biden
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Obama introduces new national security team
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Diddy wants to be adopted by Obama
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Obama, Biden speaks with world leaders
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President Obama meets with ``friend and partner'' Medvedev
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Obama introduces vp pick Biden
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New leader is announced
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Dems nominate Obama for second term as president
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John Edwards endorses Barack Obama
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Barack obama stands for change
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Obama taps into network of donors and volunteers
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Walker greets Obama
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Obama running ahead of schedule
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President-elect Obama arrives in dc
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Obama addresses Iowa Democrats:
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Obama claims Democratic presidential nomination
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President Barack Obama sworn in for second term