Agree. Romney should hit the Philly market hard. There are a lot of potential voters out there in Montgomery, Delaware, Chester, and Bucks Counties and well as in South Jersey.
Advertising on Philadelphia TV hits DE and NE MD too. I doubt MD is in action, but there are a couple of polls in NJ that have Romney trailing by 4 or 5 points. I haven't seen any polling on DE. I don't think there are enough conservative voters in southern DE to make up for Wilmington. Small State ... Small Wonder.