RALEIGH, N.C. (AP) — The national debate over gay marriage turns its attention South today, as North Carolina could be on the verge of becoming the next state to pass a constitutional amendment defining marriage as solely between a man and a woman.

In the final days before the vote, members of President Barack Obama’s cabinet expressed support for gay marriage and former President Bill Clinton recorded phone messages urging voters to oppose the amendment.

Supporters of the amendment responded with marches, television ads and speeches, including one by Jay Bakker, son of late televangelists Jim and Tammy Faye Bakker. The Rev. Billy Graham was featured in full-page newspaper ads backing the amendment.

Experts expect the measure to pass, despite the state’s long history of moderate politics.