All four of Colorado's openly gay state lawmakers are backing the rival of Brian Carroll, the first openly gay service member on active duty to run for elected office, the Denver Post reported.

Carroll served two tours in Afghanistan and one in Iraq with Army Special Forces Information Management, Special Operations Command. He continues to serve in the Colorado National Guard.

Earlier this month, Carroll announced his bid for a Colorado House seat.

“As far as I know I am the first out veteran and active national guardsman in the country to officially run for office since the repeal of 'Don't Ask, Don't Tell,'” Carroll said, referring to the recently-repealed law that banned gay and bisexual troops from serving openly.

But Carroll's rival in the Democratic primary, Rep. Andy Kerr, has the backing of all four of Colorado's openly gay state lawmakers.

Senator Pat Steadman, who introduced during the last legislative session a civil unions bill which died in committee, will host a fundraiser for Kerr on November 9 at his Denver home. The other 3 lawmakers are co-sponsoring the event.

Also backing Kerr are Robin Kniech, the first openly gay member of the Denver City Council; Bobby Clark of the Gill Foundation; and Brad Clark, executive director of the gay rights group OneColorado.