If Romney loses it's basically the status quo so I don't know what possible fall-out that would be. Besides, other than a week in October that's always seemed like the inevitable outcome if you were paying attention to poll analysis.
If Obama loses we're going to have to have a serious discussion about the how polls are conducted. Oh, and many liberals will be promptly made to eat their pledges to move to Canada.
From what I am reading the polls this time around have been based on 2008 turnout and that is not acutally the case. If that is true the Obama has a very real chance of losing this.