>>> a new book you may have heard about written by a reporter from the "new york times" about life in the obama white house, paints what is at times a not-so-flattering picture of first lady michelle obama. today she chose to fight back. our report tonight from nbc's andrea mitchell.
>> reporter: michelle obama in virginia today promoting one of her top priorities, medical care for military families.
>> please know that america will be there for you and your families.
>> reporter: a popular cause like her fight against childhood obesity. that and her signature style defined her role as first lady. not the meddling spouse portrayed in the controversial new book "the obamas." today mrs. obama challenged that portrait, as she did with gayle king on cbs.