Oh, well I'm sorry.  Last time I checked, he's in the American news more than probably any other person on the planet.  If that's not a celebrity, I don't know what is.  Are you saying politicians and people in places of power can't be celebrities?  So what about Princess Diana and her sons?
Here are a few definitions of "celebrity" for you:
noun
1. a widely known person; "he was a baseball celebrity"
2. the state or quality of being widely honored and acclaimed [syn: fame] [ant: infamy]
–noun, plural -ties for 1.
1.	a famous or well-known person.
2.	fame; renown
I believe Bush and many other government "officials" fit that definition; does they not?  Thanks for that insightful post, though.