Michelle Obama: President's Secret Weapon

'World News' anchor Diane Sawyer talks with the first lady about what her kids thought of her speech.
3:00 | 09/07/12

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Transcript for Michelle Obama: President's Secret Weapon
Tonight First Lady Michelle Obama had her second big moment up on that stage they -- she introduced her husband for his big convention speech. A couple of nights after she just brought this house down with her own passionate defense of Barack Obama but. The stamp of approval that met the most ever. Is what her two daughters their two daughters thought of her speech as she told ABC's Diane sort. And the president of the United States of America Barack Obama. She was there with your husband for his big moment tonight. I love you so much. A few nights -- -- everybody was reminded that just what a lucky man I am. Her own speech had launched this convention on Tuesday and then we'll hold the convention floor I. See the concern in his eyes. And I hear the determination in his voice as he tells me you won't believe what these folks are going -- Michelle it's not right. We've got to keep working to fix this we've got so much more to do. It was a personal story with the deeply political subtext. -- -- of the spotlight. A phone call from the White House whether the president and you're -- say they call me in the car and the girls had already gone to bed because he's that they were exhausted it was a late speech but he said he was so proud. And then the fan with the fewest words eleven year old Sasha not the next day -- called. Home talked to fashion the youngest to never compliments me on anything and she said she -- mom. He gave a really good speech last night -- all my friends you know tell me to tell you what a good job he did I was like that's so sweet turning to -- -- my eleven year old. It is out etiquette Enron had so much -- -- speech reflecting on these central focus of her life. Family the kids there they've gotten so big. I think that's what Iraq and I look at we don't look at the moment we really. Measure things by. How much the girls of her own preconceived. That the physical difference we can see the height what's the other less surprising change them. I am pleasantly surprised at how normal they are -- level headed. They work hard they care about people. And they don't take their position for granite. But they definitely don't in any way exploited war show any signs of entitlement -- just good solid kids it's the -- photos of her daughters in 2004. -- -- this list and Iraq becoming a US senator. And I remember it just so clearly see how little Sasha is. She walked up to Vice President Cheney and he reached had his hand to shake her hand. She slapped him -- -- fine she turned around and believed that the cameras tonight oh Mike. -- -- -- And here they go again this marathon run for a second term by the way. She never mentioned the Republican nominee in her speech by name because of Iraq success isn't about how much money you make. It's about the difference -- -- in people's lives. The message seemed unmistakable. So windy and -- -- -- rock these issues. Aren't political. Their personal. And term impact. Not lost. On the last Democrat to be elected to a second term Powell a man who had a good sense to marry Michelle Obama. By the way and political terms a kind of volcanoes social media. Tweeting 28000. Tweets a minute during her speech. You know that you had 28000. Tweets that the good I don't know what that wasn't that is -- I would say that it could ever. Get -- I don't know how to measure it Justin Bieber gets more tweets and -- -- -- -- that -- that rally happened. Yeah my kids my the last said that 28000. The highest paid for yourself you don't know.

This transcript has been automatically generated and may not be 100% accurate.

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