Nate Silver at FiveThirtyEight on what the national polls portend for the Electoral College:
On Sunday, Mr. Obama led by an average of about one percentage point among seven national surveys. That is not much of an edge, but better than had generally been the case for him just after the Denver debate.
What Mr. Romney will want to see are national polls showing him a point or so ahead in the race, as was the case just after Denver.
If the national polls show a tie on average, then Mr. Romney will be more of an underdog than you might think, since that is when Mr. Obama’s Electoral College advantages will tend to give him their greatest benefit. In the FiveThirtyEight simulation on Saturday, Mr. Obama won the Electoral College about 80 percent of the time when the national popular vote was tied.