As US President Barack Obama prepares to mark the first anniversary of his historic election, a new documentary reveals what was happening behind the scenes on the campaign trail.
By The People: The Election of Barack Obama began filming almost a year before the candidate announced he was running, with the crew given unprecedented access to his campaign staff and the Obama family.
The film, produced by Hollywood actor Edward Norton, airs on America's HBO channel on Tuesday.
Talking Movies' Tom Brook reports.
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