Via BuzzFlash.
(Also available in PDF version.)
Signers of Cindy Sheehan Letter
John Conyers, Jr.
George Miller
Maxine Waters
Corrine Brown
Dennis Kucinich
Carolyn Maloney
Jim McDermott
Jim McGovern
Barbara Lee
Zoe Lofgren
James Oberstar
John Lewis
Bernard Sanders
Bob Filner
Mike Honda
Raul Grijalva
Jan Schakowsky
Carolyn Cheeks Kilpatrick
Frank Pallone
Major Owens
Xavier Becerra
Lynn Woolsey
Danny Davis
Jerrold Nadler
Elijah Cummings
Hilda Solis
Gwen Moore
John Olver
Pete Stark
Sam Farr
Julia Carson
Sheila Jackson Lee
Diane Watson
Chris Van Hollen
Lloyd Doggett
Betty McCollum
Henry Waxman
Peter DeFazio
UPDATE
Surprise, surprise. If it's on the money it must be John Conyers. Apparently, Representative Conyers is the person who circulated the letter to his colleagues.