A majority of North Carolina residents oppose a proposed amendment to the North Carolina state constitution that would ban gay marriage, Raleigh-based WRAL reported.

According to an Elon University Poll released Friday, 56 percent of residents oppose the amendment lawmakers earlier this month okayed for ratification by voters in May.

Thirty-nine percent of respondents say they support the measure, a drop of 4 percentage points since March, 2009.

The survey of 594 people conducted between September 25 – 29 has a margin of error of plus or minus 4.02 percentage points.

While respondents don't want to enshrine the state's prohibition against marriage equality in the constitution, a majority also object to gay marriage. Only 33 percent of respondents said they support full marriage rights for gay couples, an increase of 12 percentage points since March, 2009.

“The ballot referendum that would ban same-sex marriage will be the issue to watch this year,” Mileah Kromer, assistant director of the Elon University Poll, said in a statement. “With North Carolinians so divided on this issue, expect a tough battle over the next few months as both sides attempt to sway public opinion in their favor.”

The proposed amendment would bar the state from legalizing marriage, civil unions and possibly domestic partnerships for gay and lesbian couples.

Twenty-nine percent of those surveyed said they support civil unions or domestic partnerships, but not full marriage, for gay couples.

(Related: NC State Senator James Forrester quotes Frank Turek in opposing gay marriage.)