BOSTON (AP) – Just days after Massachusetts legislators voted under pressure to advance a proposed constitutional amendment to ban same-sex marriage, an advocacy group says they also had a duty to vote on a proposal to guarantee affordable health insurance.

Citizens for Limited Taxation said Jan. 5 it plans to file a complaint with the state Board of Bar Overseers against 34 attorneys in the Legislature who wouldn’t vote on the health care ballot initiative and let it die.

The group says it has no position on either proposed amendment, but said a Supreme Judicial Court ruling that found lawmakers had a constitutional duty to vote on certified ballot initiatives also meant the health care proposal should have been considered.

The high court said in its Dec. 27 ruling, sought by same-sex marriage opponents, that it could not force the Legislature to take a vote.

Lawmakers sitting as a constitutional convention voted on Jan. 2 to approve the same-sex marriage ballot question, which still needs at least 50 votes in second vote this year to reach the 2008 state ballot.

“All the publicity and attention were paid to gay marriage because it’s a sexy issue,” Barbara Anderson, executive director of Citizens for Limited Taxation, told The Boston Globe.

The SJC ruling also applied to the health care amendment, she said.

“We want them to vote up or down, just like the Constitution requires,” she said.

Anderson’s group also plans to file a Bar complaint against Gov. Deval Patrick for his remarks last week urging lawmakers to use “whatever means appropriate,” including declining to vote, to kill the same-sex marriage measure.

Patrick’s spokesperson, Cyndi Roy, said the governor had no comment.

Sen. Steven Panagiotakos, D-Lowell, one of the legislators targeted by Anderson’s group, said lawmakers have immunity from such claims.

“I think they’re trying to make a political statement, but I don’t really think it has any legal foundation,” he told the Globe.