Hi martin,
You might also try crooksandliars .com, they have a pretty large collection of various diplomatic leaders and commentators. These are listed down the left hand side and can be downloaded in either .wmv or .mov file format. From there you can just seperate the audio from the video depending on your video/audio software.
Some from the list and number of video's posted
CBS (103)
CBS Evening News (13)
Face The Nation/Bob Schieffer (50)
CNN (402)
Glenn Beck (22)
Jack Cafferty (74)
Larry King (19)
Late Edition/Wolf Blitzer (48)
Lou Dobbs (28)
Reliable Sources/Howard Kurtz (35)
The Situation Room/Wolf Blitzer (98)
Hope it helps. This is just a small list. There is a pretty long list of reporters, so you might find quite a hefty amount of audio in all that.