The last time Obama visited Ground Zero was as a presidential candidate on Sept. 11, 2008, when 1 World Trade Center -- then commonly known as the Freedom Tower -- was below street level, the memorial plaza had yet to be built, and the entire project was mired in delays and cost overruns.
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President Obama to visit Ground Zero
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When Obama came into office...
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Queen to visit Ground Zero next month
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Obama announces 2012 re-election bid
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Barack Obama endorses 9/11 Mosque
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Obama is Time's Person of the Year
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One World Trade Center reaches the 20th floor equivalent
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Obama tweets for the first time
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Barack Obama inching ever closer to nomination
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Barack Obama visits Korean Demilitarised Zone
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More than 350,000 make reservations to visit 9/11 memorial
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Obama Supports 'the Right' for Ground Zero Mosque
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President-elect Obama should make a clean break with human rights abuses of past
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Obama takes first steps on road to 2012 elections
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Can Obama be re-elected?
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NeXt looks back at 2012
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Obama promises new beginning