Former gubernatorial candidate Bob Vander Plaats announced Friday he'll campaign to oust three Iowa Supreme Court judges off the bench, the Iowa Independent reported.

The three judges are among the seven who unanimously legalized gay marriage last year. Voters will decide in November whether to keep Chief Justice Marsha Ternus and Justices David Baker and Michael Streit. The remaining judges are not on the ballot this year.

Vander Plaats said he was motivated to act after learning that a federal judge on Wednesday had declared California's gay marriage ban, Proposition 8, unconstitutional.

“If the judges can do this to marriage, every one of your freedoms is up for grabs,” he said during a morning news conference on the steps of the Iowa Judiciary Building in Des Moines.

For social conservatives, Vander Plaats was the standard-bearer of gubernatorial candidates for his unrelenting attacks on the decision that brought gay marriage to the Midwest. His campaign was built on a single issue: Reverse the ruling at any cost.

He made an impressive second place showing for the Republican nomination, but GOP voters opted to go with former governor Terry Branstad, who also opposes gay marriage but has said he respects the court's decision.

Vander Plaats said he would announce additional details shortly.

Other opponents of marriage equality have also announced they'll fight to oust the judges.

About a dozen people have joined the Common Sense PAC since it formed in May. The Des Moines Register reported that the independent political fund has spent $2,272, and had $1,392 on hand as of July 15.

The group's spokesman, Dennis Guth, said the group hopes to tap into Iowa voter's growing anti-incumbent sentiment.

“We just want to clean house and start out fresh,” he said.