“Usually SCOTUS tries to avoid controversial decisions that will lead to political firestorms.”
They will not review “political questions” but one of their affirmative functions is to interpret federal statutes:
http://www4.law.cornell.edu/uscode/html/uscode08/usc_sec_08_00001401——000-.html
This may not be a political question but a question they are willing to review—whether or not the president-elect is a “natural born citizen”.
“political firstorm” If they find that he is not, yeah—the stuff’s really going to hit the fan.
And in this case which federal statute will they be interpreting?
If the document proves Obama is a citizen then that is that. But if the document proves him to be not eligible then onus is placed squarely in Obama's court. Obama and the Democrats would be responsible for any civil unrest that may occur!