Checkout this PUMA site, Hillbuzz:

http://hillbuzz.wordpress.com/2008/10/21/battleground-2008-poll-shows-statistical-tie-with-5-undecided/

Commenting on the statistical tie in the Battleground Poll:

Undecideds will go to McCain at a rate of 4:1 or higher, the same way they broke for Clinton. That means in this Battleground Poll, it’s actually McCain 52%-Obama 49%.

The other interesting thing to keep in mind is that, on average, Obama overpolled by 7% in our primaries. That means his support could actually only be at 42% in this poll above, with McCain ahead by 17-points.

We don’t see any reason to believe the trends established in the Democrats’ primaries won’t hold true for the general election.