Congressman Mike Coffman on Wednesday signed on as a co-sponsor of the Employment Non-Discrimination Act (ENDA), which seeks to prohibit workplace discrimination based on sexual orientation and gender identity.

Coffman joins six other Republican House members who have co-sponsored the measure. Rep. Tom Reed (R-N.Y.) has also voiced his support for ENDA.

“I see this legislation as the workplace equivalent of the Golden Rule – do unto others, as you would have them do unto you,” Coffman told POLITICO. “In the workplace, in 2014, we should judge employees the way we would want to be judged – based on our qualifications, our contributions and by our character, period.”

POLITICO described Coffman's endorsement as “no surprise,” explaining that the Colorado Republican “has reversed positions on immigration and abortion in recent months as he tries to fend off a challenge from Democrat Andrew Romanoff in Colorado's competitive sixth district.”

ENDA cleared the Senate in November and President Barack Obama has pledged his signature. It currently has 203 co-sponsors and needs 218 to clear the House.

Americans for Workplace Opportunity, which is backed by Republican billionaires Paul Singer and Seth Klarman, has launched a $2.2 million campaign aimed at shoring up Republican support in the House for ENDA.