From Just Foreign Policy, petition at MoveOn.org:
President Obama recently announced that he would send 450 more American service members to Iraq. They will join the 3,000 troops already there, risking their lives in a sectarian civil war that has no U.S. military solution.
Two Iraq War veterans in Congress are standing up to calls for even more war. Reps. Ruben Gallego (D-AZ) and Mark Takai (D-HI) are organizing a sign-on letter against escalating the U.S. military mission in Iraq. 
Urge your Representative to sign the Gallego-Takai letter against escalating the war in Iraq by signing our petition at MoveOn: