Former GOP presidential candidate Rick Santorum will address a Washington state anti-gay marriage group in October.

Santorum will appear at two events sponsored by the Family Policy Institute of Washington, the Christian conservative group which worked to put the state's gay marriage law on the fall ballot.

The group's director, Joseph Backholm, chairs Preserve Marriage Washington, which is organizing the campaign to repeal the law.

Referendum 74 will ask voters to either uphold or reject the marriage equality law approved by lawmakers earlier this year.

Santorum visited the state in February on the same day Governor Chris Gregoire signed the bill into law.

During a press conference, he spoke out against marriage equality, saying that as president he would push for a federal amendment banning such unions.

“We have a serious issue about trying to get moms and dads to marry and stay together,” he said, “and I don't see this [legalizing gay marriage] as encouraging that.”

At a rally held in Tacoma, protesters yelled “gay marriage is OK” at the Republican.