From the Tribune:

Sen. Barack Obama's grandmother has died, his campaign said this afternoon.

Linda Douglass, a senior aide, said Obama learned of her death about 8 a.m. Eastern time today. She said Madelyn Dunham, 87, a woman who helped raise Obama, passed between 4 a.m. and 5 a.m. Eastern time.

Obama's grandmother, who had been gravely ill, was a rock of stability, giving him the American roots that would ground his teenage years as well as his career in politics.

He suspended his campaign for part of two days recently to return to Honolulu to be at her bedside. She was in hospice care in her apartment.

The Obamas respond:

"It is with great sadness that we announce that our grandmother, Madelyn Dunham, has died peacefully after a battle with cancer. She was the cornerstone of our family, and a woman of extraordinary accomplishment, strength, and humility. She was the person who encouraged and allowed us to take chances. She was proud of her grandchildren and great-grandchildren and left this world with the knowledge that her impact on all of us was meaningful and enduring. Our debt to her is beyond measure.

"Our family wants to thank all of those who sent flowers, cards, well-wishes, and prayers during this difficult time. It brought our grandmother and us great comfort. Our grandmother was a private woman, and we will respect her wish for a small private ceremony to be held at a later date. In lieu of flowers, we ask that you make a donation to any worthy organization in search of a cure for cancer."

From the McCains:

"We offer our deepest condolences to Barack Obama and his family as they grieve the loss of their beloved grandmother. Our thoughts and prayers go out to them as they remember and celebrate the life of someone who had such a profound impact in their lives."