A question on gay marriage is being given credit for a higher than projected turnout in Maine, the AP reported.

Secretary of State Matthew Dunlap originally projected that slightly over a third (35%) of the state's registered voters would turn out to vote on Tuesday. Today, Dunlap revised that outlook, saying he believed the new figure was closer to 50%.

Maine's Question 1 asks voters to affirm – or reject – a gay marriage law approved by lawmakers in the spring.

Over 100,000 Mainers cast their votes before polling places opened on Election Day, either by absentee ballots or early voting, officials said.

While polling shows a tight contest, gay marriage advocates are hopeful Maine will become the first state to vote in their favor. Upholding the law in Maine could boost efforts to legalize gay marriage in other states, including New York and New Jersey, and the District of Columbia.