Just imagine if the Republicans had won, Bin Laden would still be out there, Ghadaffi would still be out there. The debt would be worse (McCain had pledged a stimulus of the same size, but wanted to add on additional tax cuts because... well, ya know... tax cutting and mega spending is fiscal conservatism these days) We'd be deeper into Iraq and be fighting a third front on Iran and unemployment would most likely be the same or worse.
On the plus side, we probably wouldn't have had health care reform.
By the way, for those saying we would have still gotten Bin Laden and Moamar you are lying to yourselves. Republicans decried and said it was insanity to commit to any operation in Pakistan so Al Qaeda and Bin Laden over there would have been safe. Further, Republicans had no interest and in fact, fervantly opposed the U.S. supporting rebels with No Fly Zones.