North Carolina (USA), Nov. 4 : A tearful Barack Obama paid a public tribute to his late grandmother on Monday, saying Madelyn Dunham was one of America''s "quiet heroes".
Mrs. Dunham died on Monday aged 86.
Speaking to thousands of supporters at his penultimate campaign rally, Obama delivered an impassioned vow to work for all such heroes if elected to the White House.
He became visibly emotional when he talked about Mrs. Dunham, whom he called "Toots".