When volunteers sign up to campaign for Barack Obama, they enter the world of e-politics - guided to a web site with a carefully culled, computer-generated list of people who live nearby. The volunteer is instructed to pick 25 people from the list, preferably people he or she knows - or, better yet, actual friends.
The names have been chosen by slicing and dicing a massive agglomeration of government and commercial data, using datamining technologies which identify the magazines, cars,...
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