Within hours of Oregon attorney general's announcement that she would not defend the state's ban on gay marriage in court, Oregon United for Marriage suspended its campaign to put the issue on the November ballot.

Attorney General Ellen Rosenblum said that her office would not defend the state's 2004 voter-approved constitutional amendment in a federal lawsuit, calling the ban unconstitutional.

(Related: Oregon AG Ellen Rosenblum won't defend state's gay marriage ban.)

Oregon United for Marriage began collecting signatures for a referendum to repeal the amendment last summer and said in December that it had reached its goal.

“Attorney General Rosenblum's historic announcement puts us on a strong path to securing marriage for Oregon's loving, committed couples in the courts – which is why we have decided to hold on to our signatures pending the outcome of the federal lawsuit challenging Oregon's marriage ban,” the group said in a Facebook post.

The Ninth Circuit Court of Appeals, which oversees Oregon, has already agreed to fast-track a similar lawsuit challenging Nevada's ban. Earlier this month, Nevada's attorney general withdrew from defending the case.

(Related: Nevada withdraws defense of gay marriage ban that invoked bigamy, incest.)