Ben Carson says things. REUTERS/Earnie Grafton

Dr. Ben Carson, who is considering a bid for the GOP presidential nomination, on Wednesday rejected a comparison between the fight for marriage equality and race-based discrimination because, he says, being gay is "absolutely" a choice.

"It's not the same situation because people have no control over their race, for instance," Carson said on CNN Wednesday morning.

When CNN's Chris Cuomo asked Carson whether or not he believes being gay is a choice, Carson said, "absolutely."

"Because a lot of people who go into prison go into prison straight and when they come out they're gay. So did something happen while they were in there?" Carson said.

Cuomo pushed back on the logic behind Carson's argument, pointing out that most gay people don't go to prison. Carson stood by his point.

"Are you denying that that's true? If in fact that is the case, then it obviously thwarts what you just said," Carson responded.

Regarding same-sex marriage, Carson seemed indicate that he supports domestic partnership rights that do not "require changing the definition of marriage." He also said such debates should happen at the state level.

"Here's what's important: Why do gay people want to get married? Because they want to have various rights. Property rights, visititation rights," he said. "Why can't any two human beings -- I don't care what their sexual orientation is -- why can't they have the legal right to do those things? That does not require changing the definition of marriage."