I'm not convinced you can get a TB of internal emails via a simple FOIA request.
If someone who ran a government office runs for elected office, chances are the opposing candidate will hire someone like me, and chances are I'll request all of the office's records for review. Thats how we find things like this. http://www.nj.com/news/index.ssf/2009/10/chris_christie_exce...
The relevant passage: The travel records date to when he was sworn in as U.S. attorney in 2002. They were obtained this week by the campaign of Christie's Democratic opponent, Gov. Jon Corzine, under the Freedom of Information Act.