Over the last few days, questions have come up again about this photo.
Here's a news article from early September showing the photo. The Conference that Gov. Palin was attending ran from July 11-14. The Zoo apparently released this photo, but I can find no place it was actually published prior to her nomination. I've queried the zoo twice to ask if there are more photos and both times I have been told I will receive a return call, but I never do.
Sarah, Piper and Trig are obvious, but the identities of the other two young women have been questioned extensively. The problem is that numerous captions identify the middle (taller) young woman as Bristol, and the girl farthest to the left as Willow. However, the information released by the state of Alaska to the AP regarding Palin's expense reimbursement requests do not list Willow as having gone on this trip! I have looked at it carefully. My personal opinion is that the taller young woman with pony tail in the middle of the shot is Bristol. The young woman farther to the left is an unknown person who just happened to be in the shot. I may be wrong but this is my call.
The second thing I want to clarify briefly, just for accuracy's sake is the photos that have been dissected regarding Nicole Kidman. Much has been made of how small Nicole Kidman was (on her first pregnancy) thus "proving" that Gov. Palin (on her fifth) could also have been small. Further research has been done demonstrating that some of the pictures that were posted of Ms. Kidman were dated inaccurately.
Here's is a picture of Nicole Kidman taken in mid May (May 18) when she would have been around 33 weeks pregnant. In other words, nearly exactly at the same point as the "Nail in the Coffin" photo of Gov. Palin.
Nicole Kidman 33 weeks pregnant - first child - 40 years old.
Gov. Sarah Palin 33 weeks pregnant - fifth child - 44 years old.
The photos that have been referenced elsewhere, showing a very fit Kidman with a very small "baby bump" were actually taken when she was between five and six months pregnant. Here's a shot of her leaving the gym with her trainer early in March.
Here's an article from Celebrity Babies clearly dated early March. Here's an article discussing some additional fit Nicole photos.