The reason I said it was interesting is because
he took this very image.
Now compare it to this one:
Now compare it to this one:
In Picture 1, he cuts out Bush
as well as one of Obama's daughters. With that said, what I think actually happened is that the press was at a specific distance
from the crowd. That distance as well as the constrictions of the street, forced them to make the choice between having an image where the subjects (the crowd) would be harder to make out individually (but would include the Bushs) and a visually superior image (from a technical perspective).
Now, as one last piece to support this argument, look at the number of people separating the Obamas and Bush's in each image (specially pictures 2 and 3). At the distance the photographers seem to be at (no more than 50 feet) a lot of choices need to be made. You can use a wide angle lens and get more people in (as well as that ugly scaffold in the back). You can get closer and use a wide angle lens too, and maybe get the Bushs, but then you wouldn't really have a strong representation of the crowd behind the group and you'd also have a lot of volume distortition (vantage point sacrifice). You could also avoid the wide angle all together and shoot it from one side, but it wouldn't be as powerful an image (or for that matter net as much money). The reason I say all of this is because it wouldn't be the first time. Here is the famous image of the leaders at the Charlie Hebdo march:
As you can see, the image focuses on a specific number of people. However, the image cuts off quite a few other leaders. Including Queen Rania (Jordan), Togo's President and Canada's Steven Blaney who were also there:
Well, for the same reasons I
just cited above.
Finally, There is also the possibility that the photographer didn't find the Bush's all that relevant to the story. Unless of course he was a speaker and had an important role throughout the march
other than being there.
With that said, it seems like a technical choice and not any specific bias. That's just me though. I actually know a bit about photography. Unlike certain people who would make cockamamy theories about the Bushs going to get grits or something based on graphs.