A lot of US commentators are starting to pick up on the fact that Barack Obama is skilfully using social media technologies in order to mobilise voters. The link below comes from Don Tapscott, author of Wikinomics, which is a fascinating book. He points out how Obama's team are pulling in younger voters by using social media in ways which other candidates have failed to do. If it works for politics then obviously it can work for businesses too.
http://www.wikinomics.com/blog/index.php/2008/06/05/more-on-obama-and-wikinomics/