"Clearly, the momentum is on our side," said Anthony Romero, 43, the first openly gay person and, first Puerto Rican, to head the 89-year-old ACLU.
Recently passed bills would allow Maine, New Hampshire and the District of Columbia to join Massachusetts, Iowa, Vermont and Connecticut in allowing same-sex couples to marry, The Philadelphia Inquirer reported Monday.
The California state Supreme Court is reviewing a ban on gay marriage and New Jersey Gov. Jon Corzine said he would sign a same-sex marriage bill if it reaches his desk.
Allowing same-sex marriage throughout the United States remains a top ACLU top priority, said Romero, acknowledging gay marriage faces an uphill battle in many states.
"We are used to being David to the government's Goliath," Romero said. "We've done a pretty good job with our slingshot so far."