Vermont on Friday joined New York and Connecticut in opposing the Defense of Marriage Act (DOMA), the 1996 law which prohibits federal agencies from recognizing the legal marriages of gay and lesbian couples.

Vermont Attorney General William Sorrell on Friday said DOMA unfairly discriminates against gay couples.

“These married couples – our friends and neighbors in Vermont – have every right to fair and equal treatment by the federal government,” Sorrell said in a statement. “Instead, they are denied Social Security benefits, tax exemptions, and health and retirement benefits.”

The three states jointly filed a brief in support of Edith Windsor, the 83-year-old lesbian plaintiff who received an estate bill of more than $360,000 after the death of her wife Thea Spyer. Windsor sued, arguing that DOMA violates the equal protection guarantee of the U.S. Constitution. The women were married in Canada before New York legalized such unions. New York joined the case last year.

Windsor has asked the Supreme Court to review her case.

Also on Friday, 145 House Democrats, including House Minority Leader Nancy Pelosi, Democratic Whip Steny Hoyer and New York Congressman Jerrold Nadler, filed a brief in support of Windsor.