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 MerkleyJeff MerkleyThe Hill’s Whip List: Where Dems stand on Trump’s Supreme Court nominee Dem senator accuses Trump of 'dangerous tilt towards authoritarianism' Overnight Regulation: Dems punch back in fight over CEO pay rule MORE (D-Ore.) called the announcement “HUGE” in a tweet. Sen. Chris CoonsChris CoonsSenators introduce new Iran sanctions Gorsuch sails on day one, but real test is Tuesday Live coverage: Supreme Court nominee hearings begin MORE (D-Del.) called it “a historic step.”

Sen. Kirsten GillibrandKirsten GillibrandSenators demand Pentagon action after nude photo scandal Chelsea Clinton to be honored by Variety, Lifetime Ten years later, House Dems reunite and look forward 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 UdallGorsuch's critics, running out of arguments, falsely scream 'sexist' Election autopsy: Latinos favored Clinton more than exit polls showed Live coverage: Tillerson's hearing for State MORE (Colo.) and Charles SchumerCharles SchumerA Justice Gorsuch will defend religious Americans from persecution Dem to Trump: 'You truly are an evil man' Dem senator: GOP controls all of gov't, so success or failure is on them 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.