AUGUSTA, Maine (AP) - State Sen. Dennis Damon is introducing a bill to end the prohibition on gay marriage in Maine. House Republican Josh Tardy, meanwhile, is proposing to bolster the state law restricting marriage to one man and one woman by making it a constitutional amendment. The dueling proposals ensure that gay marriage will be hotly debated this legislative session. As it stands, Maine has a domestic partnership registry that's open to gay couples. But that's not enough for gay marriage supporters. Damon says it's time to "fully end discrimination in Maine." Gay marriage is being debated elsewhere in the region. In New Hampshire, a bill's been submitted to replace the term "civil union" with "marriage" in the state's 1-year-old civil union law. Vermont, the first state to recognize same-sex couples with its civil unions law, is now likely to consider a gay marriage bill.