President-elect Barack Obama is officially resigning his Senate seat Sunday as he prepares to become the next president of the United States.
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Obama officially resigns Senate seat
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Gabrielle Giffords announces she will step down from us Congress
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Obama becomes 44th us president
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Obama reshapes Cabinet for a second term
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General Stanley McChrystal offers resignation to President Barack Obama
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Obama has fallen to earth
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Yahoo's Yang to step down
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Rep. Gabrielle Giffords to resign from Congress this week
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Jürgen Stark resigns from his position
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Obama 'to leave campaign trail'
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Seven senators resign
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State Senator Jamie Woodson will resign
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Obama announces re-election bid
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Democrats are ready to replace Obama
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Barack Obama removes agenda from website
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Barack Obama elected president of the United states
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Hillary Clinton steps down as US secretary of state