Bob Vander Plaats, head of Iowa-based The Family Leader, has compared opposition to marriage equality to efforts to abolish slavery.

Speaking with conservative radio host Steve Deace, the pair criticized Republican governors who have refused to appeal decisions knocking down state marriage bans, including Brian Sandoval of Nevada and Chris Christie of New Jersey and, most recently, Tom Corbett of Pennsylvania.

The Family Leader has made little headway in its 5-year fight against an Iowa Supreme Court decision which legalized marriage equality in Iowa.

Nevertheless, Vander Plaats, a three time failed gubernatorial candidate, insisted Republicans should not give up the fight against LGBT rights.

“We actually stand for what God has designed because, just like with slavery, the truth is on our side,” he said. “We can win this battle.”

In 2012, The Family Leader suggested that African-American families were better off under slavery, stating that “a child born into slavery in 1860 was more likely to be raised by his mother and father in a two-parent household than was an African-American baby born after the election of the USA's first African-American president.”