Sioux City businessman and former GOP gubernatorial candidate Bob Vander Plaats, who spearheaded the successful effort to oust three Iowa Supreme Court justices who ruled in favor of gay marriage, says the remaining four judges should resign, Radio Iowa reported.

Vander Plaats launched the Iowa for Freedom campaign after losing the Republican nomination for governor. His campaign was heavily financed by out-of-state anti-gay marriage groups, including the National Organization for Marriage (NOM), the nation's most vociferous opponent of gay marriage, the Family Research Council (FRC), and the Christian-based American Family Association (AFA). NOM had previously worked to repeal gay marriage laws in California and Maine.

Voters agreed with Vander Plaats on November 2, axing Chief Justice Marsha Ternus and Justices David Baker and Michael Streit, three of the seven judges whose 2009 unanimous decision brought gay marriage to the Midwest.

Vander Plaats said he is not looking for immediate resignations.

“But I do believe those four justices do need to think about the message that was sent on November 2, and I believe that they fully realize that if they would have been on that ballot along with their three other peers that they would have been voted off too, so as the appointment process takes place, I believe they need to take a look at a timeline and see if that's something that they would choose to do, is to step down to make sure that they honor the court and they don't disrupt the court proceedings by not having a quorum.”

Iowan voters removed the judges because “they stepped out of their judicial boundaries and tried to make law, govern law and amend the constitution from the bench,” he added.

Vander Plaats is also pressuring Governor-elect Terry Branstad to end the state's gay marriage law by executive order, a move Branstad has already rejected.