The National Organization for Marriage wants to overturn an Iowa Supreme Court ruling that legalized gay marriage.
The group has launched a program known as the Reclaim Iowa Project.
It is working to back statehouse candidates who will let voters decide on the issue of gay marriage.
"Iowa is important because the Supreme Court decision was so against the will of the people of Iowa and the Legislature and Gov. (Chet) Culver showed absolutely no backbone in giving the people the right to have their voices heard," said Brian Brown, the organization's executive director.
But Gov. Culver and legislative leaders said they oppose amending the state constitution to allow a ban.
The earliest a gay marriage ban could make the ballot in Iowa would be 2014.
Source: The Associated Press