Mittens Presidency might cause problems on it's own, but there is an inevitable economic trainwreck round #2 that's coming in next four years anyway. But really scaremongering leftists into voting for Democrats doesn't usually work well.
See, and that's the scariest part.
We all said that regardless of who won in 2008, it would look like a dire economic situation and either Obama or McCain would have to fight for re-election. It seems clear that President Obama or President Romney will also have a dire situation.