GOP presidential candidates Ted Cruz, Ben Carson and Bobby Jindal have joined Rick Santorum in signing the National Organization for Marriage’s presidential candidate pledge.

As we’ve reported, NOM’s pledge goes well beyond just banning same-sex marriage nationwide through a constitutional amendment. It also requires the candidate to vow to “prevent the promotion of a redefined version of marriage in public schools and other government entities” and direct the Justice Department to investigate the supposed harassment of gay marriage opponents.

Curiously, Carson told Rebecca Berg of RealClearPolitics that he is not in favor of a constitutional amendment to reverse the Supreme Court’s Obergefell decision, even though that is the very first clause in the NOM pledge that he has apparently signed.

The National Organization for Marriage (NOM) today identified four Republican presidential candidates they have dubbed “Marriage Champions” for having pledged to the American people that they will take several specific actions as president to restore marriage to the law and protect people of faith from discrimination because of their support for traditional marriage. NOM said that Sen. Ted, Cruz, Sen. Rick Santorum, Gov. Bobby Jindal and Dr. Ben Carson have emerged as the top candidates for marriage supporters.

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1. Support a federal constitutional amendment that protects marriage as the union of one man and one woman.

2. Work to overturn the US Supreme Court’s Obergefell decision that illegitimately imposed same-sex ‘marriage’ on every state in the nation, including nominating to the U.S. Supreme Court and federal bench judges who are committed to restraint and applying the original meaning of the Constitution, and appointing an attorney general similarly committed.

3. Conduct a review of actions taken by the Obama Administration that have undermined marriage and work to restore our policies to be consistent with the proper understanding of marriage as the union of one man and one woman. Consistent with this, prevent the promotion of a redefined version of marriage in public schools and other government entities.

4. Support the First Amendment Defense Act and other legislation that recognizes the right of organizations and individuals to act in the public square consistent with their belief that marriage is the union of one man and one woman without fear of retaliation from the government.

5. Direct the Department of Justice to investigate, document and publicize cases of Americans who have been harassed or threatened for exercising key civil rights to organize, to speak, to donate or to vote for marriage and to propose new protections, if needed.

“NOM has invited every candidate for president to sign our pledge, and we encourage those who have not yet signed to do so as soon as possible,” Brown said. “We will not support a candidate for president who has not pledged to the American people to take specific actions in support of restoring marriage to our law and protecting people from government discrimination over their beliefs that marriage is the union of one man and one woman.”

Brown said that several candidates have issued strong statements in support of marriage but have decided not to sign any pledges as a candidate. Governor Mike Huckabee covered marriage in his own pledge to the American people and Gov. Scott Walker has promised to support a constitutional amendment restoring true marriage.