Didn't see GWB arrive but when the camera panned there they were sitting by themselves in the pew while the clique of dems seemed engrossed in themselves. Frankly it tugged at my heart but probably didn't phase him in the least -- particularly when Pelosi kissed him, so says my hubby. I hear his Dad isn't doing very well (shocked) and couldn't make the trip so perhaps that might explain how uncomfortable he seemed.
As I said above, W looked extremely worried. The lines in his forehead are deeper. He must be very concerned about his Dad, and one can only imagine—thinking that he has to go through this soon again for his father.