It's very sad that she won't live to see her grandson become the president, but it's good that he got to see visit and see her last month.
Not that Barack Obama would ever have wanted or planned this in a million years, of course, but on an unemotional level I have to think that the timing of this sad event will work in his campaign's favor. One, McCain and Palin (who are still attending rallies today and will be tomorrow) will be forced to curtail their usual attacks on Obama's character-- or look like incredible assholes if they don't. Two, tonight's news will be inundated with Obama family photos and images of his (white) grandparents, which may just humanize him a little in the eyes of people who see him as foreign and scary. At the very least, even if they still vote for McCain, maybe some of those people will be reassured by the reminder that Barack Obama is a normal American with a normal family.