Tribal donations before and after Abramoff

[MostlyLurks]

I've heard it said here on DU that the tribes who had Abramoff as their consultant showed marked decrease in their donations to Dems after hiring Abramoff. Can somebody steer me to a source that shows this relationship?

Debunking a winger, so I need the reference to be short, sweet, preferable non-partisan and to use small words.

Thanks for help!

Mostly

On Edit: Corrected typo in thread title.
On Second Edit: Changed thread title entirely to be more obvious.