Polling since the debate in Denver last week has generally been very strong for Mitt Romney. …
A troubling sign for Mr. Romney, however, is that although he has made gains in state polls, he does not seem to have taken the lead in very many of them. …
How to reconcile this against the fact that Mr. Romney is about tied — or perhaps even has a small lead — in the average of national polls right now? [cont.]
Nate Silver, New York Times