C-SPAN, which broadcasts everything from the most mundane Senate committee hearings to hilarious White House Correspondents Dinner entertainment, has put its huge video library online with broadcasts dating back to 1987.
The library includes some 160,000 hours of broadcasts at CSPAN.org. Viewing is available free online, with copies obtainable for a small fee.
Among the offerings is likely this gem from the 2006 White House Correspondents Dinner with Stephen Colbert.