As far as Obama choosing his loyalty to other nations, I would think that the fact that he actively became involved in the Presidential campaign of Kenya to also be evidence of his loyalty to his fathers country and thus making him not eligible.There are only a lot more of them than us if you count all the dead voters and illegal voters. Otherwise we definitely out rank them.
I absolutely believe that he used a 999-99-9999 social security number at Occidental college which means he was considered a foreign student and also received foreign aid.
We can not just stop at the Birth certificate issue. His passport also would be extremely important since he visited his father first in Kenya before heading off to Pakistan. Did he or did he not apply for that passport through Kenya or Indonesia? If so, he chose his nation as an adult!
As far as Obama choosing his loyalty to other nations, I would think that the fact that he actively became involved in the Presidential campaign of Kenya to also be evidence of his loyalty to his fathers country and thus making him not eligible.