If Florida, North Carolina and Missouri go to Obama, he'll have broken through in conservative megastates. But the next potential plateau that would spell a landslide includes Georgia, North Dakota and maybe even South Carolina. If Obama wins these, he will have upset the notion of parity between the two parties and of the impregnable Republican strongholds in the South and near West. Also, watch to see what kind of popular margins Obama racks up in the most populous blue states (California, New York, Michigan, New Jersey, Massachusetts and Illinois). Big victories there could produce a popular-vote landslide that would further bolster an Obama mandate.