Barack Obama

The Transportation secretary has been a hot commodity on the campaign trail.

His remarks come as Republicans in Virginia and Texas have voiced opposition to same-sex marriage -- six years after marriage equality became law in the U.S.   

The repeal, which took effect 10 years ago today, "helped move our nation closer to its foundational promise of equality, dignity, and opportunity for all," Biden said.

"I would love my legacy to be overshadowed, because it would mean another president was doing even more to protect LGBTQ rights."

Coons, who championed repeal during his first month in office, discusses progress made and progress needed in a video for The Advocate.

In his A Promised Land memoir, the former president said he used to use antigay slurs, like the f word, without concern.