Contacting le petit republicain directly, especially if you're not from CT, is probably useless. You will be ignored, no doubt.
However, the senate is a pretty exclusive little club. And Democratic senators make up an even more exclusive club. What if each Democratic senator received contacts from their own constituents to pull some weight with him? Might it make a difference if he started hearing from his peers?
I suggest we find out.
Let's each contact our own Democratic senators as well as the minority leader and let them know how we feel about Mr. Lieberman's overtures to the privatizing potentates. Maybe it'll make an impression.
The Senate Democrats have a web page (http://democrats.senate.gov/). Find your senators there or at http://www.senate.gov/. Ask them to let Mr. Lieberman know his antics have caught the attention of their constituents who are not happy.
It's a long shot, but here's hoping. Feel free to add notes on possible scripts, etc.