Just google your senator's name and you'll find the information.

ReddHedd:

"Your action steps: call both your Senators first thing in the morning and ask if they support Russ Feingold's censure proposal. If they don't, ask what their position is on the issue -- and why.
The more people we have calling, the more staffers in the offices start to realize that Feingold struck a political chord with a bunch of us in America. And then the more we continue to call, the more that message starts to sink in...and then some. Plus, it forces Senators to go on the record one way or the other, which is useful information for all of us to have...read on

georgia10 has more contact information:

"Five minutes is all it takes, really. Less, if you're not that chatty. In five minutes, you can speak up for the rule of the law. In five minutes, you can put your own footprint in history, as one of the mass of millions who advocated for the censure of a President who broke the law...read on"