Here is how to contact your senator or representative (from the US Senate Website)
All questions and comments regarding public policy issues, legislation, or requests for personal assistance should be directed to the Senators from your State. Some Senators have e-mail addresses while others post comment forms on their web sites. When sending e-mail to your Senator, please include your return postal mailing address. Please be aware that as a matter of professional courtesy, many Senators will acknowledge, but not respond to, a message from another Senator’s constituent.
By Postal Mail
Office of Senator (Name)
United States Senate
Washington, D.C. 20510
Alternatively, you may phone the United States Capitol switchboard at (202) 224-3121. A switchboard operator will connect you directly with the Senate office you request.
If you are in Oregon, as I am, you can go the the House of Representatives website and put in your zip code, find your rep, and write to them (it’s the same address as in the Senate).