This may be due to the media deciding what the poll numbers should be and then adjusting the sample space (oversampling of DemonRats) to produce the desired outcome - not too high, not too low.
The race will be decided based on campaigning and advertising in the final two months, when voters finally start listening. The race will be decided based on the differences between our "likely voter" models and reality. The race will be decided based on economic performance in August and September. Mostly, the race will be decided based on the degree to which we can get every living conservative to the polls on election day, and the degree to which ACORN and SEIU can get every dead liberal to cast a ballot despite not having a pulse. We need to make this the highest turnout election ever, to make sure that we expand our margin in the House, take the Senate (likely but not assured), and have the mandate to force Romney to govern like candidate Romney, not like Governor Romney and the man he has been all his life.
A few days ago, the WaPo came out with a poll in which they claimed to oversample Demonrats by an 11 point advantage. That would have been journalistic malfeasance at its best, but when they had over 35% of the polled claiming to be independent, but the internals show that over 48% of the “independents” polled are actually registered Demonrats, you know the poll is seriously screwed up, and it only had Obambi up by a few points.