Firewall in ruins?

Major Garrett at National Journal has a good post-second debate column in which he reports that the Obama campaign seems to have abandoned most of its three-state (Florida-Ohio-Virginia) firewall. Those are the three states with 60 electoral votes—Obama’s weakest 2008 states except for Indiana and North Carolina—which the Obama campaign has been pummeling for months with anti-Romney TV spots. The idea is that if they could hold these three states and all those Obama carried with higher percentages in 2008 Obama would have 332 electoral votes, and could afford to lose a small state here or there. That’s why they were constantly saying that Romney had only a narrow window to get to 270.