Indiana House members appear to be divided on a proposal to put a gay marriage ban in the Indiana Constitution.

The House is scheduled to begin debate on HJR-3 on Monday. A House vote could take place later today.

According to a poll conducted by The Indianapolis Star, 38 lawmakers said they plan to vote for the amendment, while 38 said they plan to vote against it. Thirteen representatives said they were undecided and 11 refused to answer.

In 2011, the House backed the measure with a 70-26 bipartisan vote.

“Everyone assumed it would be closer this time than in 2011,” Andy Downs, director of the Mike Downs Center for Indiana Politics at Indiana University-Purdue Fort Wayne, told the paper. “But this is a lot closer than I think people would have expected.”

Indiana is the first state to consider a marriage ban since the Supreme Court ruled a key provision of the Defense of Marriage Act (DOMA) unconstitutional in June. DOMA, which prohibited federal agencies from recognizing the marriages of gay couples, inspired many of the state bans that followed.

A House panel on Wednesday voted to send HJR-3 to the full House. The vote came a day after House Speaker Brian Bosma, a Republican from Indianapolis, pulled the proposed ban out from the House Judiciary Committee, where support appeared weak after a hearing the week before, to the House Elections and Appointment Committee, where all 9 Republicans voted for the measure.

If the proposal clears the Indiana House and Senate, then voters will decide the issue in November.