The Supreme court will deny any case against obama on the grounds that they can not bring relief( remove obama). Only congress can remove obama. A citizen may be born on U.S. soil and be a Natural born citizen , but being born on U.S. soil does not automatically make you a citizen or Natural born. The Natural born citizen clause of the Constitution is a security clause meant to remove foreign influence fron the office of the President. with obama as president I now see why such a clause was necessary!
Most of my sources(constitutional law ) believe that if the Supreme Court were to define Natural Born citizenship, it would be in 5/4 in favor of both parents being U.S. citizens. I don’t think obama like the odds,and will attempt to block any case.