After a long battle Barack Obama has declared himself "the Democratic nominee for president of the United States".
See how the polls changed over the course of the campaign between Hillary Clinton and Barack Obama, with key video moments.
Poll graphs based on Gallup data collated by independent polling resource website Pollster.com. Full data from these and other polls, including detailed methodology and margin of error adjustments, can be found on the dedicated pages 2008 National Democratic Presidential Primary and 2008 National Republican Presidential Primary.
One-Minute World News 
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