A final poll of likely North Carolina voters conducted over the weekend continues to give a constitutional amendment banning gay marriage and civil unions an easy margin of victory in Tuesday’s election while the Democratic contest for governor is tightening.

The referendum holds a 16-point advantage, 55 percent in favor and 39 percent against, according to the Public Policy Polling survey, a left-leaning Raleigh-based firm. The numbers shifted little in the final week as big-names on either side of the debate – Rev. Billy Graham for and former President Bill Clinton against – made final pleas to persuade voters.

Many voters still don’t understand what the amendment would accomplish, pollster Tom Jensen said, noting that a majority of North Carolinians support some legal recognition for same-sex couples. “Opponents of the amendment had an uphill battle in convincing voters that it was anything other than a referendum on gay marriage, even though it does go a lot further than that” by forbidding civil unions and domestic partnerships, he said.