Congressional Research Service
The Congressional Research Service , known as "Congress's think tank", is the public policy research arm of the United States Congress. As a legislative branch agency within the Library of Congress, CRS works exclusively and directly for Members of Congress, their Committees and staff on a confidential, nonpartisan basis. Wikipedia*
On the C-SPAN Networks:
Congressional Research Service has hosted 1 event in the C-SPAN Video Library; the first program was a 2003 Forum. Most common tag: House of Representatives.