You wrote that you believe that Obama has always been consistent in his claim that he was born in Hawaii's Kapiolani hospital.
Queens Hospital is Obama's birth hospital? Well, I found the following information on the web that is taken from the Illinois Assembly encyclopedia, which appears to be an official and important Illinois Assembly document.
"Barack Obama was born at the Queen's Medical Center in Honolulu, Hawaii to Harvard University-educated economist Barack Hussein Obama, Sr., a native of Kenya, and S. Ann Dunham, of Wichita, Kansas. At the time of Obama's birth, both his parents were students at the East-West Center at the University of Hawaii at Manoa. Of his years in Hawaii, Obama has written, "The irony is that my decision to work in politics, and to pursue such a career in a big Mainland city, in some sense grows out of my Hawaiian upbringing, and the idea..."
1. Illinois is a long way from Hawaii.
2. So, I would think that the only way the Illinois Assembly Encyclopedia would know that Obama was born in Queens hospital is if Obama himself told them.
3. The following may have happened: The Illinois Assembly Encyclopedia probably sent a routine personal information sheet to all the members of the Illinois Assembly to fill out, including Obama.
4. In my opinion, if Queens hospital is listed in the official Illinois Assembly Encyclopedia and Obama never tried to correct or change the Queens hospital statement, then I would think it is safe to believe that Obama approved of the Queens hospital statement.