Behind the façade of a nondescript building in Beantown’s north end, Mitt Romney’s presidential campaign headquarters is buzzing with activity. Campaign placards, detailed maps of swing state media markets, and other flair adorn the walls. Recycling bins are loaded with telltale empty cans of diet soda. Caffeine might as well be oxygen here. Televisions in the rapid response bullpen are tuned to President Obama’s latest speech in Ohio. As the president thunders about “roads and bridges,” aides watch attentively, exchanging notes and coordinating the campaign’s reaction in real time. Columns of cubicles break up the expansive ground floor, their weary but relentless occupants tapping away on keyboards and juggling several electronic devices apiece. In a sign of the times, a sign hanging in the copy room reads: “Shred everything you wouldn’t want to see #trending” – a cautionary nod to the viral capacity of social media engines such as Twitter. The campaign is accelerating into a full sprint as the 2012 presidential race enters its final leg. Fewer than 50 days remain.