The Supreme Court’s decision to not review Obama’s legal eligibility for high office could be historic. There have been cases made that the 14th Amendment was not Constitutionally binding, but these cases can be argued either way.
I have no idea of how the country will act if the economy gets bad, but it can be expected that there would be movements within some states to ‘opt-out’ of unpopular national programs that would be imposed upon them.
Obama’s defense about his birth certificate (“this is not about that piece of paper”) leads me to believe he is not a naturalized Citizen. By the letter of the Constitution, this would make everything done by the Executive after 20JAN09, to be questionable in a very simple and understandable way.