The Human Rights Campaign announced today that it is giving another $225,000 to support efforts to make gay marriage legal in Maine.

The country’s largest lesbian, gay, bisexual and transgender civil rights organization has now given $703,000 to Maine. The latest donation is part of a $1 million investment in the four states voting on gay marriage this year, the group said in a press release.

“Our adversaries have bragged that marriage equality has never won at the ballot box,” HRC President Chad Griffin said. “This November, we will take that talking point away once and for all.”

Maine, Maryland, Washington and Minnesota will all vote on gay marriage on Nov. 6. Maryland and Washington voters will decide whether to uphold laws passed by their legislatures that allow same-sex marriage. In Minnesota, voters are being asked if they support a constitutional amendment to ban gay marriage.

The vote in Maine marks the first time gay activists have brought the issue directly to voters.

Those seeking to allow gay marriage in Maine have piled up a big financial advantage, according to the latest campaign finance reports. Mainers United for Marriage, the lead supporters, have raised $3.35 million this year, while Protect Marriage Maine, the lead opponent, has raised $429,794.

Correction: An earlier version of this story incorrectly reported the amount of the gift from the HRC. It has now been corrected to reflect the actual amount.