In a full-page ad in Sunday's Columbus Dispatch, evangelist Billy Graham called on Ohio voters to back the candidate who opposes gay marriage, a reference to Mitt Romney.

The ad featured a black-and-white photo of Graham along with the following text: “On Nov. 6, the day before my 94th birthday, our nation will hold one of the most critical elections in my lifetime. We are at a crossroads and there are profound moral issues at stake. I strongly urge you to vote for candidates who support the biblical definition of marriage between a man and a woman, protect the sanctity of life and defend our religious freedoms. The Bible speaks clearly on these crucial issues. Please join me in praying for America, that we will turn our hearts back toward God.”

While President Barack Obama came out in favor of gay nuptials in May, Romney supports passage of a constitutional amendment limiting marriage to heterosexual couples.

Nearly two weeks ago, Romney met with Graham at his North Carolina retreat to secure his endorsement. Graham said he would do all he could to help him reach the White House.

(Related: Franklin Graham knocks Obama on gay marriage nod.)