CONTACTING MEMBERS OF CONGRESS
There's no direct electronic contact to members of Congress by non-constituents. From the "Write Your Representative" page:
"Can I send a message to a Member who does not represent my congressional district? -- Congressional courtesy dictates that Representatives be given the opportunity to assist their own constituents. The Write Your Representative service does not allow for the processing of messages to a Member that does not represent the state and zip code entered. If direct contact with a specific Member that does not represent your district is required, the Clerk of the House maintains addresses and phone numbers of all House Members and Committees, or you may call (202)225-3121 for the U.S. House switchboard operator."
The Senate page is organized quite differently, but it's safe to assume that a similar policy is in effect.
So if you wish to contact anyone other than Senator Murray, Senator Cantwell, or Congresswoman McMorris-Rodgers, use telephone, snail mail, or facsimile.
HOUSE OF REPRESENTATIVE
Representative John Boehner, Speaker
House of Representatives
1101 Longworth House Office Building
Washington, D.C. 20515
202-225-6205
202-225-0704 FAX
Representative Eric Cantor, Majority Leader
House of Representatives
303 Cannon House Office Building
Washington, D.C. 20515
202-225-2815
202-225-0011 FAX
Representative Kevin McCarthy, Majority Whip
House of Representatives
326 Cannon House Office Building
Washington, D.C. 20515
202-225-2915
202-225-2908 FAX
Representative Frank Lucas, Chairman
House Agriculture Committee
2311 Rayburn House Office Building
Washington, D.C. 20515
202-225-5565
202-225-8698 FAX
Representative Hal Rogers, Chairman
House Appropriations Committee
2406 Rayburn House Office Building
Washington, D.C. 20515
202-225-4601
202-2250940 FAX
Representative Paul Ryan, Chairman
House Budget Committee
1233 Longworth House Office Building
Washington, D.C. 20515
202-225-3031
202-225-3393 FAX
Representative Fred Upton, Chairman
House Energy & Commerce Committee
2183 Rayburn House Office Building
Washington, D. C. 20515
202-225-3761
202-225-4986 FAX
Representative Richard “Doc” Hastings, Chairman
House Natural Resources Committee,
1214 Longworth House Office Building
Washington, D.C. 20515
202-225-5816
202-225-2908 FAX
Representative Darrell Issa, Chairman
House Oversight & Government Reform Comm.
2347 Rayburn House Office Building,
Washington, D.C. 20515
202-225-3906
202-225-3303 FAX
Representative David Camp, Chairman
House Ways & Means Committee
341 Cannon House Office Building
Washington, D.C. 20515
202-225-3561
2020-225-9679 FAX
SENATE
Senator Harry Reid, Majority Leader
U.S. Senate
522 Hart Senate Office Building
Washington, D.C. 20510
202-224-3242
202-224-7327 FAX
Senator Mitch McConnell, Minority Leader
U.S. Senate
261-A Russell Senate Office Building
Washington, D.C. 20510
202-224-2541
202-224-2499 FAX
Senator Maria Cantwell
U.S. Senate
717 Hart Senate Office Building
Washington, D.C. 20510
202-224-3441
202-228-0514 FAX
Senator Patty Murray
U.S. Senate
173 Russell Senate Office Building
Washington. D.C. 20510
202-224-2621
202-224-0238