The first lady's office would only say she was staying in Washington to be with family. Monday is younger daughter Sasha Obama's 12th birthday, and Mrs. Obama early on declared herself "mom in chief" and always has said her girls come first.
Summit between President Obama and Chinese President Xi Jinping tomorrow and Saturday are their first since Xi was installed in March. They were meeting at Sunnylands, a sprawling desert estate with a private golf course in Rancho Mirage.
But a person in Beijing familiar with the preparations said that when National Security Adviser Tom Donilon visited last week to hammer out plans for the summit, both sides talked as if the two women would meet.
Publicly, Beijing is muting any hurt feelings over Mrs. Obama's no-show at Sunnylands. Asked whether her absence was regrettable, Foreign Ministry spokesman Hong Lei said, "Regarding the relevant arrangements on the US side, we respect them."
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Peng holds the rank of major general in the People's Liberation Army and was a popular singer on state television, best known for her stirring renditions of patriotic odes, often while wearing full dress uniform. Many Chinese were interested in seeing how she compares with the United States' own glamorous, high profile first lady.
"The Chinese public will actually be quite unhappy, because they are quite proud of their first lady's role in diplomacy," Zhang said in a telephone interview. "If Michelle doesn't go, it will make it difficult for our first lady to perform.