On the outside, it looks like just another metal and glass high-rise. Inside, just steps off Michigan Avenue's busy shopping thoroughfare, beats the heart of Barack Obama's presidential campaign. No signs announce the presence of Obama's campaign headquarters. Even if you know it's there, you can't just saunter in. Security guards in the lobby restrict access. The headquarters' main floor is college dorm meets modern office - a high-tech epicenter of young people where muted green and gray walls are plastered with campaign memorabilia, and a mishmash of tables helps make the most of every inch of the 33,000 square feet. A calendar with Obama's picture on it has this message: "Party Like It's 1-20-09" (Inauguration Day). ...
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