The polls (when crosstabs are available) are seen to be largely oversampling Dems +5 to as much as Dems +19- Repubs and Indies are undersampled.. Most of them are just Adults or Registered Voters vs Likely Voters, all of which leads to results which reflect Garbage In: Garbage Out.
The Legacy Media has a vested interest in seeing Obama re-elected, and even if they didn't, a "close" race is much more interesting to their viewers and readers.
You'll see the polls start to reflect reality a few weeks out from the election, so the pollsters can maintain their reputations. Until then, its all theater.
Honestly- how many Obama/Biden 2012 bumper stickers and lawn signs are you seeing??