Last summer, Tyagi’s involve­ment with Demos became an issue in her mother’s campaign. Demos had sued the state of Massachusetts to enforce the National Voter Registration Act, and the state settled by mailing voter registration forms to welfare recipients. Brown charged that Democrats, through Tyagi, were trying to boost Democratic voter rolls and Warren’s turnout in the November election.

With her husband, Sushil Tyagi, a former film producer in India and the United States, Amelia Warren Tyagi has three children, Octavia, 11; Lavinia, 7; and Atticus Mann, nearly 2, whom Warren and Mann baby-sit regularly enough to describe their personalities and quotidian accomplishments in exhaustive detail.

These days, the baby in ­Warren’s house is Otis, the mellow golden retriever she walks around Fresh Pond with Mann when not on the campaign trail. Fortune, she says, has been kind to her.