Topeka ? Both supporters and opponents believe voters will add a ban on same-sex marriage and civil unions for gay couples to the Kansas Constitution if given the chance.

The House was to take final action Wednesday on a proposed constitutional amendment, and its adoption would put the measure on the April 5 ballot. The measure would amend the state constitution to declare that only traditionally married couples are entitled to benefits associated with marriage.

During a debate Tuesday, supporters said the measure would protect the traditional definition of marriage — in state law since 1867 — from legal challenges. They also argued that Kansas residents want to vote.

“Our job is not to supplant the will of the people with a will of our own,” said Rep. Eric Carter, R-Overland Park.

Opponents described the measure as discriminatory and suggested history would judge legislators unfairly for adopting it.

“You’re going to cause real pain to real people if this amendment passes — and I assume it will pass,” said Rep. Jeff Jack, R-Parsons.

In a statewide vote, a simple majority could amend the constitution.

In the House on Wednesday, supporters needed a two-thirds majority, or 83 of 124 votes, for final adoption.

On Tuesday, the House voted 89-28 to give first-round approval to the measure, setting up Wednesday’s vote. The Senate approved it Jan. 13.

In other action, Attorney General Phill Kline outlined proposals to increase penalties for child pornography and sexual exploitation of children. Kline had a Statehouse news conference flanked by more than 100 law enforcement officials.

Also, a senator who opposes abortion introduced a bill Tuesday to restrict where the procedure can be performed.