First lady Michelle Obama arrives Sunday, Aug. 16, 2009, at Sky Harbor International Airport in Phoenix. The Obama's were en route to the Grand Canyon for a day trip. (AP Photo/Matt York)
- First lady Michelle Obama arrives Sunday, Aug. 16, 2009, at Sky Harbor International Airport in Phoenix. The Obama's were en route to the Grand Canyon for a day trip. (AP Photo/Matt York)
- First lady Michelle Obama and daughter Malia Obama, walk off Air Force One at Grand Canyon National Park Airport in Tusayan, Ariz., Sunday, Aug. 16, 2009. (AP Photo/Dana Felthauser)
- President Barack Obama with first lady Michelle Obama, and daughters Malia Obama, and Sasha Obama, front right, walk off Air Force One at Grand Canyon National Park Airport in Tusayan, Ariz., Sunday, Aug. 16, 2009. (AP Photo/Dana Felthauser)
- President Barack Obama with first lady Michelle Obama, and daughters Malia Obama and Sasha Obama, front right, walk off Air Force One at Grand Canyon National Park Airport in Tusayan, Ariz., Sunday, Aug. 16, 2009. (AP Photo/Dana Felthauser)
- First lady Michelle Obama walks down the stairs of Air Force One with her daughter Malia Obama, 11, Sunday, Aug. 16, 2009 at Sky Harbor International Airport in Phoenix. The Obama's were returning from a trip to the Grand Canyon. (AP Photo/Matt York)
- President Barack Obama, his wife Michelle Obama, and daughters Malia Obama, 11, Sasha Obama, 8, with Interpretive Park Ranger Scott Kraynak look out over Hopi Point as they tour the Grand Canyon in Grand Canyon National Park, Ariz., Sunday, Aug. 16, 2009.(AP Photo/Alex Brandon)
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