First Lady Michelle Obama says her husband has never forgotten how he started and knows what it's like for struggling families.

The first lady's speech Tuesday night at the Democratic National Convention focused more on biography than on policy differences that President Barack Obama has with Republican nominee Mitt Romney.

With the economy recovering so slowly, Mrs. Obama is seeking to make the case that actions her husband took as president reflect his desire to help others live the American dream. She cites payroll tax cuts and efforts to prop up the auto industry as examples of his looking out for working families.

Mrs. Obama says that, at the end of the day, her most important title is mom in chief.