I was using the term "grades" rather loosely. I should have said "academic achievements," specifically the magna cum laude from Harvard Law, editorship of the Harvard Law Review, etc.
I also compare the way the two men speak, Bush in particular seeming unable to string words into intelligible sentences and stumbling often. As I said, I don't really think Bush is a stupid man, but I think it's pretty obvious that Obama is one helluva lot brighter.
I have to say, though, that in the past year, Obama hasn't seemed as smart as I once thought he was, and Bush, though I still think he's a totally despicable, lying weasel and probably the worst President the US ever had, isn't as dumb as I used to think he was. But he never should have been President. It was a fucking disaster on all fronts.