Why Vice President Biden Was 'Proud' To Officiate This Wedding For Two White House Staffers

"Couldn't be happier."

Vice President Joe Biden is making his final months as second-in-command count.

On Monday, Biden officiated a wedding for the first time. According to CNN, the VP received a temporary certification from the District of Columbia to marry Brian Mosteller and Joe Mahshie, two White House staffers.

Mosteller is the director of Oval Office operations for President Barack Obama, while Mahshie is First Lady Michelle Obama's trip coordinator.

Biden tweeted a photo of the ceremony, which took place in his residence at the U.S. Naval Observatory in Washington, D.C., and was attended by the couple's family. 

He captioned the tweet, "Proud to marry Brian and Joe at my house. Couldn't be happier, two longtime White House staffers, two great guys."

The photo has since received tens of thousands of retweets, including one from Second Lady Dr. Jill Biden, who added, "Love is love!"

Vice President Biden has been vocal about his support for same-sex marriage rights since before even President Obama. In 2012, he became the highest-ranking American official to endorse gay marriage, prompting Obama to publicly adjust his own stance on the issue. 

The next year Biden said of LGBT rights, "It's the civil rights of our day. It's the issue of our day."

In 2015, the U.S. Supreme Court ruled gay marriage legal nationwide.