Sean Eldridge, a gay rights activist and husband of Facebook co-founder Chris Hughes, announced Sunday that he's running for Congress.

“I'm excited to announce that I'm running to represent New York's 19th District in Congress,” Eldridge tweeted.

“I have been very blessed in my life. I'm proud to live in the greatest state in the greatest country on Earth. I'm running for Congress because I know we can do better,” Eldridge said in a nearly 3-minute video announcing his campaign. (The video is embedded on this page. Visit our video library for more videos.)

New York's 19th District, which sits north of New York City, is currently held by two-term Republican Chris Gibson.

Gibson handily beat his 2012 Democratic challenger, Ulster County Democratic Party chairman Julian Schreibman. Gibson's campaign was endorsed by all the major papers in the district and he won with 53 percent of the vote. President Barack Obama won the district in 2012 with 52 percent of the vote.

Eldridge was heavily involved in Obama's first presidential campaign. In 2010, he joined Freedom to Marry, the nation's largest non-profit working solely on expanding marriage rights for gay and lesbian couples. He currently serves as the group's senior advisor.

Eldridge is the president of Hudson River Ventures, an investment fund focused on the Hudson Valley.

If elected to Congress, Eldridge could help increase the number of openly LGBT House members, of which there are currently 6.

(Related: Facebook's Chris Hughes, Sean Eldridge marry in New York.)