Democratic National Committee Chairwoman Debbie Wasserman Schultz (D-Fla.) called it "a proud moment." Rep. Jared Polis (D-Colo.), the first openly homosexual member of Congress who is also a parent, thanked Obama in a tweet.

Sen. Jeff MerkleyJeffrey (Jeff) Alan MerkleyOvernight Energy: Senate confirms Bridenstine as NASA chief | Watchdog probes Pruitt’s use of security detail | Emails shine light on EPA science policy changes 32 male senators back Senate women's calls to change harassment rules Duckworth brings her baby to Senate vote, drawing a crowd MORE (D-Ore.) called the announcement “HUGE” in a tweet. Sen. Chris CoonsChristopher (Chris) Andrew CoonsOvernight Defense: Pompeo clears Senate panel, on track for confirmation | Retired officers oppose Haspel for CIA director | Iran, Syria on agenda for Macron visit Pompeo headed for confirmation after surprise panel vote Pompeo lacks votes for positive vote on panel MORE (D-Del.) called it “a historic step.”

Sen. Kirsten GillibrandKirsten Elizabeth GillibrandBudowsky: End the DNC malpractice Overnight Finance: Mulvaney remark on lobbyists stuns Washington | Macron takes swipe at Trump tariffs | Conservatives eye tax cut on capital gains | Gillibrand unveils post office banking bill | GOP chairman pushes banks on gun policies Gillibrand unveils bill to offer banking services at post offices MORE ‏ (D-N.Y.) thanked the president for his leadership on LGBT equality and later went on to ask her followers to join her in expressing their public support for the president. And Rep. Nita Lowey (D-N.Y.) said all Americans deserve to have a long and happy marriage like her own.

Democrats including Sens. Mark UdallMark Emery UdallSenate GOP rejects Trump’s call to go big on gun legislation Democratic primary could upend bid for Colorado seat Picking 2018 candidates pits McConnell vs. GOP groups MORE (Colo.) and Charles SchumerCharles (Chuck) Ellis SchumerCan Mueller be more honest than his colleagues? Throwing some cold water on all of the Korean summit optimism House Republicans push Mulvaney, Trump to rescind Gateway funds MORE (N.Y.), Reps. Jim Himes (Conn.) and Jackie Speier (Calif.) and mayors from D.C., Newark and New York City rushed Twitter within the first hour of the interview to add their support to Obama's position and express their own opinions.

No Republicans rushed to tweet a reaction to the news, but GOProud, a leading Republican organization that supports LGBT rights, released a statement cautiously praising Obama’s announcement.

“This is hardly a profile in courage by President Obama. For years now, President Obama has tried his hardest to have it both ways on this issue,” co-founder Christopher R. Barron said in a statement. “The real kudos here goes to LGBT activists and their allies who finally forced the President into yielding on this issue.”

Similarly, the Log Cabin Republicans slammed Obama for failing to speak out earlier, particularly prior to the referendum vote by North Carolina the previous day when voters passed an amendment defining marriage as only between a man and a woman.

“Log Cabin Republicans appreciate that President Obama has finally come in line with leaders like Vice President Dick Cheney on this issue, but LGBT Americans are right to be angry that this calculated announcement comes too late to be of any use to the people of North Carolina, or any of the other states that have addressed this issue on his watch," said Executive Director R. Clarke Cooper in a statement. "This administration has manipulated LGBT families for political gain as much as anybody, and after his campaign’s ridiculous contortions to deny support for marriage equality this week he does not deserve praise for an announcement that comes a day late and a dollar short.”

—This post was updated at 3:35 and 3:58 p.m.