I really don't care at this point. The next president will be a one-termer. If Obama wins, the Dems will control everything and as always happens when one party controls all three branches, they will go insane. If Obama wins, Republicans will regain control of Congress in 2010, particularly when the liberal Dems push the so-called "Fairness Doctrine." That will fire up the conservative Republicans to an unbelievable extent. If McCain wins, Republicans and Democrats will still go insane and 2012 will be very weird as VP Palin campaigns for President against the Democrat rival.
Other than some minor differences, there isn't much separating the two. Lots of taxes are coming to make sure that millions of government workers keep their fat bennies while the rest of us get nationalized medical insurance. And with the collapse in oil prices, the shitheads in Iran and Venezuela will crawl back under their rocks so we won't have to deal with them for a long time, negating those foreign policy differences.