If the campaign had unlimited resources they would fight everywhere. But no campaign ever has unlimited resources. Certainly not this campaign. If Trump is in Pennsylvania that means he’s not in Florida or Ohio or Colorado. There’s no evidence of a path for him to win Pennsylvania - he would be smart to use his resources (time, staff and money) wisely.
“If the campaign had unlimited resources they would fight everywhere.”
I would like to see the Trump super pacs start taking it to Clinton the way Bush did with Kerry. Bush stayed with the high end message and the pacs did the “swiftboating” and it worked out well. Clinton has a lot more baggage than Kerry did.
Total resources spent by Clinton in PA = original planned spending + Trump effort in PA.
In other words, resources available to Clinton in OH+FL+CO
= Total Clinton resources for OH+FL+CO - Clinton resources spent in PA.