If I went to meet the president I wouldn't dress well for him. As I'm a not a US citizen this isn't suprising. However, if I went to meet Tony Blair or the Queen I wouldn't dress well for them either. This is more to do with the fact that I don't care much for Tony Blair or the Queen.
I don't think he meant GWB in particular, or Tony Blair, or the Queen, because obviously some people don't like them. I think he was trying to state that you would want to present yourself nicely to a person of high authority who you would respect.
This actually reminds me of a conversation I had with my dad on the way home from church. (We had talked about this subject in class.) His explanation has always been "It's out of respect; if you were going to see the president, you would wear something nice."
Anyway, I agree that you would present yourself nicely to someone in that position, but they can't read what your heart feels. God can. It's not that you spend a bunch of money on an elaborate outfit to wear to church, it's that you don't distract others from what they came to do. (Sorry, I know it's repetitive to bring up the distraction thing again!)