An estimated 600 couples wed during brief period in May 2014
Some disappointed in Carter's remarks at event
Democrats seek action on grants, contractors doing business and marketplace discrimination
Measure says currently policy 'out of date' with medical understanding
Minter becomes of the highest-ranking trans officials in administration
GOP hopeful says trans personality should vote for him
Vote on measure is 53-42, short of 60-vote requirement
Second-time candidate once decried open service for gays in the military
Policy change mirrors decision made by Army months ago
Earnest appears to walk back earlier support for ending policy
