Seven Republican presidential candidates will be travelling to Iowa today to take part in a “presidential family forum” hosted by The Family Leader, a social conservative group led by activist Bob Vander Plaats, who is seen as a kingmaker in the Iowa caucus.

Ben Carson, Ted Cruz, Carly Fiorina, Mike Huckabee, Rand Paul, Marco Rubio and Rick Santorum will all be speaking at the forum, at which the candidates are arranged family-style around a Thanksgiving table. (At the 2011 forum, Michele Bachmann memorably took it upon herself to serve water to all of the male candidates.)

The endorsement of Vander Plaats, whose backing helped catapult Huckabee and Santorum to Iowa caucus victories in 2008 and 2012, is one of the most coveted in the state. While most observers think that Cruz will nab Vander Plaats’ endorsement, the activist is keeping his options open. Vander Plaats told a reporter that although Donald Trump was unable to make tonight’s forum, he told him, “If you can guarantee me your endorsement, I will turn the plane around and get there.”

As Vander Plaats’ previous endorsements of Huckabee and Santorum show, he has a powerful machine ready to push an ideologically pure social conservative. Back in 2010, Vander Plaats also led a successful effort to remove three Iowa Supreme Court judges who participated in the court’s landmark unanimous marriage equality decision.

But to get that endorsement, candidates must cater to an activist far the right of mainstream voters. Not only does Vander Plaats want to remove from office or defund the courts of judges who find in favor of marriage equality, he believes that anything, like gay marriage, that “goes against the law of nature” is by definition unconstitutional . He argues that the government is an institution of God and therefor its purpose is “to promote righteousness” and to apply “God’s principles and precepts.” He once warned that God might withdraw his blessing from America because of a Wiccan prayer at the Iowa state capitol.

Vander Plaats has suggested that marriage equality could lead to legal protections for pedophilia and “ a parent marrying their child” and compared the “public health risk” of homosexuality to second-hand smoke. He has praised Russian President Vladimir Putin for his “decisive leadership” in preventing “homosexual propaganda” in his country.

Taking its anti-gay sentiment to a new level, The Family Leader was a sponsor of a conference earlier this month — at which Cruz, Huckabee and then-candidate Bobby Jindal spoke — whose organizer, Kevin Swanson, called for the death penalty for gay people and warned that God would judge America for liking the Harry Potter series too much. (The group later clarified that it does not support violence against gay people but declined to denounce Swanson.)

Speaking at an event last year, Vander Plaats played a video showing a gay pride event alongside the Boston Marathon bombing and mass shootings as illustrations of the “darkness” that has fallen over America:

Vander Plaats had also dabbled in birther conspiracy theories, implying in 2011 that the president’s birth certificate was missing and praising Trump for his “bold” crusade to uncover the truth about the president’s past.