With only 2 days left in the campaign, a new poll shows a referendum which would legalize gay marriage in Maine leading.

According to a Public Policy Survey of 1,633 likely voters, 52 percent of respondents said they plan to vote for Question 1, while 45 percent said they plan to vote against it. Three percent said they were not sure.

Pollsters, however, added a caveat: “What we've found historically with these gay marriage ballot measures though is that undecided voters tend to end up voting anti-gay. So if I had to guess this is something more like a 52/48 advantage and at that point it can go either way – this is likely to be a pretty close vote.”

In 2009, lawmakers approved a marriage equality law, but it was repealed with a “people's veto.” Three years later, supporters are returning the question to the ballot box, hoping to make Maine the first state to legalize such unions by referendum.

(Related: In Maine, son says his moms are his best role models.)