The media and politicians who repeatedly lie

How do newspapers deal with politicians who go on repeating lies? looks at that very question:

But how do reporters who are doing their level best to tell their readers the truth cope when candidates move from spouting (just about acceptable) spin to telling (unacceptable) lies?

Unfortunately, he doesn't really come up with a solution. It's a bit of a shame really as we have an Opposition Leader who gets away with it repeatedly.