Michelle Obama: Wife of the Party

Democratic National Convention kicks off as the president's most popular asset, his wife, speaks.
3:00 | 09/04/12

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Transcript for Michelle Obama: Wife of the Party
Good evening. I'm terry moran in charlotte, north carolina. Day one of the democratic national convention. And here just, just a little while ago, michelle obama brought down the house. They had the signs "we love michelle." This one is prepackprepackaged, no question about it. But the emotion response spontaneous, as michelle obama told the nation why she believes her husband deserves another four years in the white house. When she speaks of their love and dreams. No question about, michelle obama is the president's advocate. She's the president's not so secret weapon. Serving as your first lady is an honor and privilege. Reporter: When she stepped in the spotlight tonight, michelle obama is taking into prime time a role she's groomed and honed into in the four years in the white house. First, advocate. So in the end for barack, these issues aren't political, they're personal, because barack knows what it means when a family struggles. Reporter: She was a star here, the delegates clearly adore her. A star on a mission. With her husband inhe fight of his political life. Their future on the line, mrs. Obama took her vast national audience into the past. Their past, that young couple starting out. We learned about dignity and decency. That how hard you work matters more than how much you make. Those are the values that barack and I and so many of you are trying to pass on to our own children. That's who we are. Reporter: And she spoke as only she could, of how the presidency has shaped barack obama. After so many struggles and triumphs and moments that have tested my husband in ways i never could have imagined, i have seen first hand that being president doesn't change who you are. No, it reveals who you are. Reporter: Tonight, michelle obama was basking zbla iing not just in the approval of the crowd here at the convention, but in a wider popularity that's considerably higher than her husband's. Her years as first lady, healthy eating advocate, fashion icon have made her a celebrity and more. She had an approval rating of 66% in the recent gallup poll. Not only do they realize how great she is, but popular now. Reporter: We got up on the convention floor with jodie kantor who wrote the book "the obamas." How much does this mean to them? It means everything. Really, this election is a judgment. Mitt romney has got essentially the country saying we gave the obama guy a shot, and we don't want to continue that. Reporter: And right now, there are ominous trends for president obama, especially among women, a new abc news/"washington post" poll revealed a startling erosion, the president has gone from a 57% to 39 percent favorable/unfavorable rating to a 56/46 slit today. She's real to women. Better than anybody else. Reporter: That, of course, is what ann romney was trying to do for her husband at the republican convention. I love you, women! Reporter: They are so different, and yet each so crucial in this campaign. One became a lawyer and had a career in health care. One worked at home, raising five sons. As her husband and their daughter cozy on the couch watch back home in the white house, she joked pointedly about their youthful financial struggle. Yeah, we were so young, so in love and so in debt. Reporter: And perhaps they appeal to different kinds of women voters. We heard from the left of the spectrum here. Did you see ann romney speak at the republican convention? I did. What did you make of that? I couldn't believe how it was, a little offensive. For a party that spends so many time trying to strip away women's rights. Reporter: But michelle obama's goals was to transcend all the differences so in the end, she spoke to all those women and men in her universal role as mom. If we want to give all of our children a foundation for their dreams, opportunities worthy of their promise, if we want to give them that sense of limitless possibilities, their belief that here in america there is always something better out there, if you're willing to work for it, then we must work like never before. And we must once again come

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

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