If you have read Obama's memoir, you will immediately understand why he would suspend a national campaign for the most powerful job on earth to be with his grandmother right now. One gets the impression from Robert Gibbs and from this decision that this might indeed be one of the last chances he gets. "Toot" was a formative figure - she brought him up with her husband during some critical years. Her death would be the death of his last parent. Reading about her again tonight, you can see where Obama's personal social conservatism comes from. There's a lot more Kansas in Obama than most people on the right seem to think.
Prayers for her, her family and the man who now has to deal with this emotional burden at this exposed and intense time. They are all still human, you know. It never hurts to remember that. And we all forget it sometimes.