Obama for America nearly doubled the size of its staff on payroll in the summer, growing from 168 employees in July to 327 as of Sept. 30, according to the campaign’s third quarter financial report. At this point four years ago, Obama hadn’t yet clinched the Democratic nomination, much less establish a nationwide campaign staff.

And with the current office space at roughly half-capacity, campaign officials expect the team to double in size once more by early next year, adding more researchers, media monitors, grassroots organizers and administrative staff.

For now, the empty rows of desk tables play host to jumbles of supplies, empty take-out food containers and a couple of expired aluminum beer kegs, signs that the vibrancy of the young Obama team is not all lost in the seriousness of the task at hand.