Nate Silver and others have pointed out that the polls appear to have underestimate democratic performance at the polls
This is what Nate Silver said on election night:
So far, however, Democrats also have an edge in the party identification numbers in the exit polls. In Ohio, 38 percent of voters identified as Democratic in the exit poll as compared with 31 percent of Republicans. And in Virginia, Democrats had a 37-to-33 advantage in party identification. These numbers are similar to what many pre-election polls showed.
This is what Nate Silver said on election night:
So far, however, Democrats also have an edge in the party identification numbers in the exit polls. In Ohio, 38 percent of voters identified as Democratic in the exit poll as compared with 31 percent of Republicans. And in Virginia, Democrats had a 37-to-33 advantage in party identification. These numbers are similar to what many pre-election polls showed.
http://fivethirtyeight.blogs.nytimes.com/2012/11/06/live-blo...
Can you point to where he adjusted this analysis?