Brian Brown, the president of the National Organization for Marriage (NOM), on Saturday compared allowing gay couples to marry to slavery.

NOM is the nation's largest group devoted to reversing the Supreme Court's decision striking down bans on gay marriage in all 50 states.

The group gained momentum when it successfully campaigned for a constitutional amendment banning such unions in California. Proposition 8 became unenforceable after it was declared unconstitutional in 2013.

All along Brown has attempted to paint opponents as victims.

He returned to this theme while speaking to an audience at the Family Leadership Summit in Ames, Iowa, where he told social conservatives who had gathered to hear from 10 Republican presidential candidates that he would not give up the fight.

“Did Frederick Douglass give up when he was fighting against slavery?” Brown rhetorically asked, a reference to the African-American abolitionist.