I applied through college or university. The process took 1 week. I interviewed at National Consitution Center in Mar 2013
Interview
Intial steps: E-mailed a letter of interest along with resume and three writing samples.
Shortly after got invited to a one on one with the Assistant PR representative. The questions were pretty straightforward. " Why do you want to work here?" "What do you hope to gain from your experience?"
They were very nice and polite, even got to view some exhibits.