At The Hill Christian Henize writes a blog called GOP 12 and he comes up with very convincing data that the race is in a different place in October than it was in September. We knew this intuitively but he supports our intuition with facts.
Heinze aggregates polls to show that Romney leads in many more polls in October than he did in September in three key battleground states: Ohio, Virginia, and Florida. His data is from the RCP chart of polls, a reliable source. Check it out.