The first presidential debate and the vice presidential debate are both available as free downloads thru iTMS.

  2004 First Presidential Debate: Bush Vs. Kerry (9/30/04)

 2004 Vice Presidential Debate: Cheney Vs. Edwards (10/5/04)

If you don’t have iTunes installed, the links above will take you to a download page for the iTunes application. Alternatively, the debates are available directly from audible.com here