So what will the public's opinion be on this?
I personally do not see how any good natured person could condemn such a decision. Sure, he is leaving the campaign trail in the final 15 days, but seriously, its his grandma. Obama has made it very clear in his speeches how important this woman is to him. She raised him. He has pointed out time and time again that without her, he would not be where he is today.
But what of John McCain's decision to leave the campaign trail to focus on the economy several weeks ago?
It seemed to me as though almost everyone saw what it really was: a publicity stunt to win voters who had doubts about Obama's economic policies. Contemplating the reason for these candidates leaving the campaign trail is a contemplation of the character of the men themselves. McCain decided to try and win over votes by "leaving the campaign" to "focus on the economy". Obama is leaving for 2 days to visit his grandmother, the woman who raised him, because she is incredibly ill. He may be a grandma's boy, but at least we know he's not trying to win a sympathy vote or something.
Oh, and here's an article if you're interested