At the White House, Obama watched his wife's speech with the couple's two young daughters.
"I'm going to try to not let them see their daddy cry because when Michelle starts talking, I start getting all misty," the president said at rally earlier Tuesday in Norfolk, Va.
Mrs. Obama likely will have one more turn in the convention spotlight later this week. She is expected to introduce her husband Thursday night when he accepts the Democratic nomination before a crowd of up to 74,000 and a television audience of millions across the country.
The Obamas' daughters, Malia and Sasha, are also expected to join them on stage during the convention's closing night, leaving voters with fresh images of the photogenic family.
While at the three-day convention, Mrs. Obama will also focus on shoring up support for her husband among key constituencies. She plans to speak to the party's African-American, Hispanic and women's caucuses and address a gay and lesbian luncheon. Along with the vice president's wife, Jill Biden, the first lady will also participate in an armed services event Thursday and put together care packages for U.S. troops serving overseas.
The first lady took the stage Tuesday as the most popular figure in this year's presidential campaign. She earns higher favorability ratings than her husband, his Republican rival, the other contender for first lady or either candidate for the vice presidency, according to the latest Associated Press-GfK poll.
In the poll, conducted before the Republican convention began, 64 percent of Americans said they had a favorable view of Mrs. Obama. The president came in at 53 percent favorable.
Follow Julie Pace at http://twitter.com/jpaceDC