Denver, Aug 26 : It was a family affair for the Obamas last night - Michelle delivered the keynote speech at the Democratic National Convention, Barack appeared via satellite video, and their youngest daughter, Sasha, stole the show in the end.

After the aspiring first lady delivered a moving address in which she called her daughters "the center of my world," she brought the girls from the side of the stage into the spotlight, while Stevie Wonder's "Isn't She Lovely?" played in the background.

Barack Obama, speaking live from the campaign trail in Kansas City, joined the three.

"How about Michelle Obama?" Obama boomed to the cheering crowd. "Now you know why I asked her out so many times, even though she said no. You want a persistent President," The New York Post quoted Obama, as saying.

He told his wife that she was unbelievable and "you look very cute."

Michelle Obama wore a fitted turquoise dress.

During their exchange, his younger daughter, 7-year-old Sasha, suddenly called out to her father, delighting the audience.

"Hi, Daddy!" she said.

When Obama asked her how she thought her mom did, she said, "I think she did good."

Barack replied, "I think she did, too."

The little girl repeatedly reached for her mother's microphone during her parents' conversation, and before the video was shut off, she shouted, "I love you, Daddy."

His 10-year-old daughter, Malia, was also onstage but didn't speak.

During her speech, Michelle Obama painted herself as a representative of American values, while seeking to assure voters that her husband shares those values, despite his "funny name."

Michelle Obama took heat on the campaign trail for saying she was proud of America for the first time after her husband became a serious candidate, and the campaign hoped to use her convention speech to soften her image.

"I come here as a wife who loves my husband and believes he will be an extraordinary president," she said.

She also used her speech to compliment Hillary Rodham Clinton, saying the New York senator "put those 18 million cracks in the glass ceiling, so that our daughters - and sons - can dream a little bigger and aim a little higher."

The remark drew resounding applause.

ANI