Okay, I solved the mystery. The photo is not of Ann Dunham, but a blogger named Noelle McAfee who wrote about Ann Dunham, and at the source page it would be easy to conclude that the picture is of Stanley Ann Dunham (and apparently a lot of people did just that.) Google crawler made that link also.
I've removed the link to my photobucket, but for posterity's sake this is not Barry's mother:
