Democrats moved to act on gun reform after Orlando massacre
2016 candidate makes a first for a presumptive presidential nominee
Announcement comes on anniversaries of three Supreme Court LGBT rulings
2016 hopeful observes efforts of plaintiffs Obergefell, Windsor
June 26 anniversary of Obergefell, Windsor and Lawrence decisions
Ryan accuses Democrats of exploiting Orlando shooting to raise funds
Dems seek vote on expanding background checks, 'no fly, no buy'
House votes on unrelated Labor Department measure, not background checks
Civil rights leader Rep. John Lewis leads Dems in action
Florida Gov. Rick Scott has faced criticism for his response to the shooting