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Ellen DeGeneres will air a special segment on her talk show “Ellen” today thanking Obama for becoming the first US president to endorse gay marriage.

DeGeneres, who has been married to actress Portia de Rossi since 2008, filmed the speech just after Obama made his comments in support of same-sex marriage to ABC during an interview at the White House yesterday.

“What an amazing day for our country,” says DeGeneres, sitting in a chair while addressing the camera in a pink blazer and plaid tie. “President Obama just came out in support of same sex marriage and I say, ‘Wow.'”

Her audience cheers loudly.

“There have been moments in history when someone has the courage to stand up for what they believe in, and that one action changes everything,” says DeGeneres. “I hope this is one of those times.”

“It takes a brave man to take a stand like this — especially in an election year,” DeGeneres continues, on the verge of tears. She then stands up to give a standing ovation. “So I say, Mr. President thank you very, very, very much.”

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DeGeneres joins a host of celebrities who have applauded Obama on Twitter.

Lady Gaga wrote, “Obama, congratulations on being the first sitting President to support marriage equality. Feels like the future, and not the past. #NoFear.”

Neil Patrick Harris added, “Bravo, Mr. President, and thank you.”

And Ricky Martin said, “I applaud President @barackobama for affirming that ALL Americans should enjoy equal rights. Historic!”

Obama is currently on his way to Los Angeles, where he will attend a star-studded fundraiser at George Clooney’s home tonight. Expected to raise $15 million, the guest list includes Robert Downey Jr., Barbra Streisand, J.J. Abrams and many more.