The US Democratic presidential hopefuls are preparing to take part in the first debate to use only video questions submitted online by the public.The link-up by broadcaster CNN and the video-sharing website YouTube is being hailed as a political milestone.
More than 1,700 30-second questions had been uploaded by Friday, ranging from Iraq to health care and Darfur. About 25 to 30 will be put to the candidates.
Analysts say online video could play a big role in the 2008 White House race.
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