A few scenarios that underscore how Romney still faces an uphill climb between now and election day.
1. Obama loses Ohio, Florida, Colorado, and New Hampshire (all of which he previously led until Romney's recent surge) but manages to retain Virginia. Under this scenario he gets reelected.
2. Obama loses Virginia, Colorado, Iowa, New Hampshire, and Florida (again, five states he led before Romney's surge), yet retains Ohio where he currently still leads. Under this scenario, he still get reelected despite squandering a lead in the aforementioned five important swing states.
3. Obama loses Ohio, Florida, Virginia, but retains Colorado, Nevada, and New Hampshire, and gets reelected.
The big problem for Romney is that if the election were held today, he would probably not have enough to win, and so he needs to retain his momentum for at least another week to tip polling sufficiently in his favor to where he would carry a state like Ohio. The flip side of that coin is that if he spends too much time in Ohio, Obama can reverse his gains in places like Virginia and Colorado. Can Romney run the table and win Florida, Virginia, and Ohio ? If he does, he still may not win if he can't hold on to Colorado.