Jim Gray has served as Lexington mayor since 2011
Former NYC mayor an early advocate for marriage equality
But 2016 hopeful omits mention of Equality Act
Some say leading LGBT rights group 'represents the 1 percent'
'They are standing up and fighting the important fights'
Gay nominee pledges to make soldiers 'highest priority'
Sanders dubbed LGBT group 'establishment' after endorsement for Clinton
Obama-appointed judge cites precedent in 7th Circuit to deny claim
'New York will not stand for discrimination against transgender people'
Groups say on Twitter they're "disappointed" with candidate