Washington Blade | Biden: LGBT discrimination the 'civil rights issue of our time', 30 Oct 2012
Advocate | Biden Calls Transgender Discrimination 'Civil Rights Issue of Our Time', 31 Oct 2012

one year later...
buzzfeed | Delaware's Beau Biden Urges Legislature To Pass Transgender Protections, 16 June 2013

two years later ...
obamawhitehouse.archive.gov | Remarks by the Vice President and Dr. Biden to the Human Rights Campaign Los Angeles Dinner, 23 Mar 2014

[...]
Look, I don't want this just to be a rah-rah speech here.  I mean what I say, it's clear we have a long road to travel to change hearts and minds and laws all around the world.  But we're beginning to do it.  We're beginning to do it.

I want to talk to you about what the President and I are doing to help us get there.  Barack and I believe that the rights of LGBT people is an inseparable part of America's promotion of human rights around the world. No, no, no, it really -- it cannot, is not distinguishable.  It's a false distinction made in the past.  The first and most important thing this administration has done is to use the bully pulpit of the most powerful nation on Earth to stand up in defense of LGBT rights around the world.  It means speaking up against the criminalization of LBGT status or conduct, as President Obama has ordered all agencies working overseas to do.
[...]

three years later...
tuscaloosanews | Biden's 2012 gay marriage 'gaffe' now an advantage, 4 Oct 2015

[...]
Hillary Rodham Clinton also has a committed following in the LGBT community, as was evident in the program before Biden spoke. Each time the former secretary of state appeared on screen the audience erupted in applause.
[...]

four years later...
WEF | Joe Biden calls for business to lead on LGBT rights, 5 Feb 2016

[...]
During the the World Economic Forum's Annual Meeting in Davos, he met with numerous executives including Nathan Blecharczyk, co-founder of apartment-sharing company Airbnb; Muhtar Kent, chairman and CEO of the Coca Cola Company; and Anthony Scaramucci, founder of hedge fund SkyBridge Capital.

"When it comes to LGBT rights in the workplace, the world is looking to you," Biden told them. "You have more impact than anything the federal government has done."

The vice president was adamant that the conduct of senior management was core to advancing the LGBT agenda. "You can literally change the terms of the debate ... You actually put governments on notice," he said.

Biden also praised the progress already made. Only a few years ago, he pointed out, business leaders would have ignored homophobic remarks. "You would have all kept you mouths shut. We wouldn't have said anything. Today, name me a business meeting in the United States of America with someone who would do that."

That sentiment was echoed by Beth Brooke-Marciniak and Shamina Singh, speakers on the first ever LGBT panel at Davos.
[...]

Since our founding, America has advanced on an unending path toward becoming a more perfect Union.  This journey, led by forward-thinking individuals who have set their sights on reaching for a brighter tomorrow, has never been easy or smooth.  The fight for dignity and equality for lesbian, gay, bisexual, and transgender (LGBT) people is reflected in the tireless dedication of advocates and allies who strive to forge a more inclusive society.  They have spurred sweeping progress by changing hearts and minds and by demanding equal treatment -- under our laws, from our courts, and in our politics.  This month, we recognize all they have done to bring us to this point, and we recommit to bending the arc of our Nation toward justice.
[...]

Hillary Clinton was the force behind a little-known breakthrough in transgender rights. So why doesn't she talk about it?