From the WaPo:
CHARLOTTE, N.C. -- The day took a tragic turn for Sen. Barack Obama when his ailing grandmother, Madelyn Dunham, died today.My sincerest condolences to Senator Obama and his family. I had hoped that she would have held out long enough to see the election through. No one deserves a loss such as this the day before they make history.
Obama spokeswoman Jen Psaki said Dunham died at home late last night in Hawaii, or roughly between 4 a.m. and 5 a.m. Eastern. Obama learned of the news a little after 8 a.m. in Florida, where his campaign held a morning rally.
The campaign released a statement from Obama and his sister Maya Soetoro-Ng this afternoon:
"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.