I applied online. The process took 2 days. I interviewed at Common Cause (Washington, DC) in Feb 2014
Interview
Phone Interview then in person interview. The interviewer was very pleasant. I was interviewed about a month and a half before I started. Basic questions concerning the organization and then questions about specific political legislation. A transcript was not required.
Interview questions [1]
Question 1
What do you know about the organization?
What political topics currently interest you?
What were your grades in writing classes?