Obama is leaving the campaign trail for two days to go to Hawaii because his grandmother, Madelyn Dunham, is gravely ill. To respect the family's privacy, they're not releasing any information, but the implication is that she's near death. Ms. Dunham helped to raise Obama, and they were very close. With his mother having passed away, this must be very difficult for him, especially at this time. I hope that she recovers and lives to see her grandson become President.