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Summary Box: Twitter's big role in 2012 campaign

Associated Press Published: May 7, 2012

WHO'S ONLINE: Barack Obama, Mitt Romney, campaign strategists, journalists and political junkies have all flocked to Twitter.

INFLUENCE: While relatively few voters are on the social-networking service, it's become an essential tool for campaigns to test-drive themes and make news with a group of politically wired "influencers" who process and share those messages with the broader world.

FILTER: When a voter is exposed to any information related to the 2012 presidential contest, chances are it's been through the Twitter filter first.