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Here are a few scenes from a revolution: In early February, Barack Obama ended a six-month press-conference drought by taking questions from YouTube. When a madman crashed his plane into a Texas office building a couple of weeks later, the White House responded on its blog. And during the bipartisan summit on health reform, press secretary Robert Gibbs used Twitter to keep score.

"We have a theory of how the news media work in this Internet age," explains Dan Pfeiffer, the buzz-cut 34-year-old who recently became the third person to serve as Obama's communications director