Glenn Beck has defended Rick Santorum's opposition to gay marriage, saying: “You can't change the variables.”

Speaking Friday on his radio program, the conservative celebrity suggested marriage equality would destroy marriage.

“I don't care. If you want to sleep with your boyfriend and you're a guy, you want to sleep with your girlfriend, that's up to you. You don't destroy marriage to do it,” Beck said.

“I have exactly the same opinion on gay marriage that President Obama has, unless he's lying,” he said, then added that he supports civil unions for gay and lesbian couples.

Beck also came to the defense of Santorum, who compared gay marriage to polygamy when challenged by students at a campaign stop at New England College in Concord, New Hampshire.

“The equation is: one man plus one woman equals marriage,” Beck said in defending Santorum's opposition to the institution.

“You can't change the variables,” he later added. (The video is embedded in the right panel of this page. Visit our video library for more videos.)