NEW YORK, NY October 06, 2008 —With its 21 electoral votes, Pennsylvania is one of the most highly-contested battleground states.

And, with the McCain campaign’s decision to pull out of Michigan, the battle over Pennsylvania is likely to get even more fierce.

Today is the deadline for registering voters in Pennsylvania and yesterday WNYC’s Arun Venugopal rode along with a busload of Obama volunteers who went to Northern Philadelphia to register voters.