What exactly makes you think, "this changes everything?"
I'm not like the hardcore Republicans that are saying that Obama's presidency will be a complete disaster, but what makes you think Obama is going to have the power to change anything? This is what kills me about the huge celebrations/fanfare about Obama winning, what is he going to do to help you? He has promised the world like every other politician, but 90% of what he said that he wants to do will never get done. His health care system is almost certain to not get passed, there will be enough objection from both sides to see to that. Taxes on every front will almost certainly be raised, but that is not something to be cheering. Iraq is not going to change much if at all, with the job there being mostly done (thanks to the surge, supported by McCain but not Obama). On the economy in general, the bailout package I think has illustrated that the government cannot do much in the face of a strong trend in the market.