In the popular vote I agree with you that it is more likely that Obama wins by more than 4% than that the Republican candidate (presumably Romney) does. However, IMO when you look at it from a bottom up standpoint and go state by state I give the Republicans the edge.
Why? If you look at it state by state it basically endorses what I say pretty well, specifically if you look at the two states you mentioned, Pennsylvania and Florida. RCP polling averages are both in Obama's favor (although a more recent poll in PA gave Romney a lead within the margin of error). Obama's lead in Florida is in fact larger than Romney's in Pennsylvania. Furthermore, Obama's nationwide approval ratings have been increasing over the last month or so, and it's not unreasonable to think that some fraction of that will carry over to swing states. This is why I say that things are fluid, but with the fundamentals in Obama's favor. (barring economic catastrophe of course)
Pennsylvania in particular is not the swing state it was when I was growing up there, it has become steadily more Democratic over time. (the last time it went Republican was almost 25 years ago in 1988) Once again it's quite early to say anything, but I just don't see how current information would lead you to those conclusions. They seem to be based on gut feelings, which was sort of my point to begin with. There's no hard data from which to make any map that means anything.