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The “We” Apparently Doesn’t Include Bush: NY Times Crops George And Laura Bush Out Of Selma Pic
I suspect the cropping was done as much to keep The One, Cummings, and Chewbacca recognizably in the center. 50th anniversary and all that.

Looking at photos of the 60's shows far more whites then than now marching in the parade. Doubt this is anything but an "invitation" thing, but it conveniently maintains the narrative.
I've heard a number of would-be marchers backed out when they heard former President George W. Bush would be participating. Don't know if it's true, but it's certainly believable.
Update at 10:35: It is true, and a MLK lieutenant at that. See here.

Posted by: Hupineger Glomomp52169 2015-03-09
http://www.rantburg.com/poparticle.php?ID=412408