The black-and-white five-minute video follows two separate videos by US President Barack Obama and Secretary of State Hillary Clinton's last year.

New York Sen. Kirsten Gillibrand said in the video: "Every loving couple should have the right and privilege to be married, to be able to celebrate that love, to celebrate that commitment, with all of their friends and loved ones around." 

"I know it's not easy," says Sen. Mark Udall (D-Colo.) in the video. "It's not OK for your peers, for adults, or for anyone to make you feel like you’re doing something wrong by being yourself."

The Senators featured are Richard Blumenthal (D-Conn.), Sherrod Brown (D-Ohio), Maria Cantwell (D-Wash.), Chris Coons (D-Del.), Dick Durbin (D-Ill.), Dianne Feinstein (D-Calif.), Al Franken (D-Minn.), Kirsten Gillibrand (D-N.Y.), Chuck Schumer (D-N.Y.), Jeanne Shaheen (D-N.H.), Mark Udall (D-Colo.), Sheldon Whitehouse (D-R.I.), and Ron Wyden (D-Ore.).